Difference between revisions of "Selaginella weatherbiana"

R. M. Tryon

Amer. Fern J. 40: 69. 1950.

Common names: Weatherby's spike-moss
Endemic
Treatment appears in FNA Volume 2.
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|common_names=Weatherby's spike-moss
 
|common_names=Weatherby's spike-moss
 +
|special_status={{Treatment/ID/Special_status
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|code=E
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|label=Endemic
 +
}}
 
|basionyms=
 
|basionyms=
 
|synonyms=
 
|synonyms=
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}}<!--
  
--><span class="statement" id="st-d0_s0" data-properties=""><b>Plants </b>on rock, forming clumps.</span> <span class="statement" id="st-d0_s1" data-properties="stem architecture or shape;stem location;stem location;stem shape"><b>Stems </b>radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked;</span> <span class="statement" id="st-d0_s2" data-properties="stem architecture;stem location;stem architecture or shape;branch count;tip course">rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight;</span> <span class="statement" id="st-d0_s3" data-properties="stem location;stem orientation;stem orientation;stem growth form;stem fragility or size;branch architecture or shape">aerial stems erect, less often ascending, cespitose, stout, branches not conspicuously arrested, budlike branches mostly near base.</span> <span class="statement" id="st-d0_s4" data-properties="rhizophore count;rhizophore diameter;rhizophore diameter;stem architecture;stem position;stem location"><b>Rhizophores </b>borne on upperside of stems, mostly restricted to rhizomatous stems or to lower 1/2 of aerial stems, 0.16–0.26 (–3) mm diam.</span> <span class="statement" id="st-d0_s5" data-properties="leaf growth form;leaf arrangement"><b>Leaves </b>dimorphic, not clearly ranked.</span> <span class="statement" id="st-d0_s6" data-properties="stem-leaf architecture;stem-leaf duration;stem-leaf fixation or orientation;stem-leaf orientation;stem-leaf orientation;stem-leaf shape"><b>Rhizomatous </b>stem-leaves persistent, loosely appressed, ascending, often incurved, scalelike.</span> <span class="statement" id="st-d0_s7" data-properties="stem-leaf location;stem-leaf fixation or orientation;stem-leaf orientation;stem-leaf coloration;stem-leaf shape;stem-leaf shape;stem-leaf shape;stem-leaf length;stem-leaf width"><b>Aerial </b>stem-leaves tightly appressed, ascending, green, linear-lanceolate to narrowly lanceolate, 1.7–2.4 X 0.36–0.43 mm;</span> <span class="statement" id="st-d0_s8" data-properties="abaxial ridge prominence">abaxial ridges prominent;</span> <span class="statement" id="st-d0_s9" data-properties="base shape;base shape;base pubescence;base pubescence;apical branch portion shape;apical branch portion fusion;apical branch portion fusion">base cuneate and decurrent on main-stem or rounded and abruptly adnate on apical branch portions, glabrous or pubescent;</span> <span class="statement" id="st-d0_s10" data-properties="margin architecture or pubescence or shape;cilium coloration;cilium orientation;cilium shape;cilium orientation;cilium some measurement">margins short-ciliate at base, cilia transparent, spreading, denticulate, and ascending toward apex, 0.03–0.06 mm;</span> <span class="statement" id="st-d0_s11" data-properties="apex shape">apex keeled;</span> <span class="statement" id="st-d0_s12" data-properties="bristle coloration;bristle coloration;bristle coloration;bristle coloration;bristle coloration;bristle pubescence;bristle pubescence;bristle pubescence;bristle atypical some measurement;bristle some measurement">bristle transparent to opaque or yellowish to brownish (on old leaves), puberulent to smooth, 0.3–0.6 (–0.7) mm.</span> <span class="statement" id="st-d0_s13" data-properties="strobilus architecture or arrangement or growth form;strobilus atypical some measurement;strobilus some measurement"><b>Strobili </b>solitary, (0.7–) 1–3 cm;</span> <span class="statement" id="st-d0_s14" data-properties="sporophyll shape;sporophyll shape;sporophyll shape;abaxial ridge prominence;base pubescence;margin shape;margin shape;margin shape">sporophylls narrowly ovatelanceolate to lanceolate, abaxial ridges prominent, base glabrous, margins denticulate to short-ciliate, apex keeled, bristled.</span> <span class="statement" id="st-d0_s15" data-properties="apex shape;apex shape;2n chromosome count">2n = 18.</span><!--
+
--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>on rock, forming clumps. <b>Stems</b> radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; aerial stems erect, less often ascending, cespitose, stout, branches not conspicuously arrested, budlike branches mostly near base. <b>Rhizophores</b> borne on upperside of stems, mostly restricted to rhizomatous stems or to lower 1/2 of aerial stems, 0.16–0.26(–3) mm diam. <b>Leaves</b> dimorphic, not clearly ranked. <b>Rhizomatous</b> stem leaves persistent, loosely appressed, ascending, often incurved, scalelike. <b>Aerial</b> stem leaves tightly appressed, ascending, green, linear-lanceolate to narrowly lanceolate, 1.7–2.4 × 0.36–0.43 mm; abaxial ridges prominent; base cuneate and decurrent on main stem or rounded and abruptly adnate on apical branch portions, glabrous or pubescent; margins short-ciliate at base, cilia transparent, spreading, denticulate, and ascending toward apex, 0.03–0.06 mm; apex keeled; bristle transparent to opaque or yellowish to brownish (on old leaves), puberulent to smooth, 0.3–0.6(–0.7) mm. <b>Strobili</b> solitary, (0.7–)1–3 cm; sporophylls narrowly ovate-lanceolate to lanceolate, abaxial ridges prominent, base glabrous, margins denticulate to short-ciliate, apex keeled, bristled. <b>2n</b> = 18.</span><!--
  
 
-->{{Treatment/Body
 
-->{{Treatment/Body
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|elevation=1600–3000 m
 
|elevation=1600–3000 m
 
|distribution=Colo.;N.Mex.
 
|distribution=Colo.;N.Mex.
|discussion=<p>One of the most striking features of Selaginella weatherbiana is that at branch forks the larger branch continues to grow as a vegetative shoot, and the smaller one usually forms a strobilus. Therefore, the strobili appear to be lateral rather than terminal. Selaginella weatherbiana grows in close association with S. underwoodii (R. M. Tryon 1955). The two species (as well as S. mutica var. mutica) are very often mixed on herbarium specimens.</p><!--
+
|discussion=<p>One of the most striking features of <i>Selaginella weatherbiana</i> is that at branch forks the larger branch continues to grow as a vegetative shoot, and the smaller one usually forms a strobilus. Therefore, the strobili appear to be lateral rather than terminal. <i>Selaginella weatherbiana</i> grows in close association with <i>S. underwoodii</i> (R. M. Tryon 1955). The two species (as well as <i>S. mutica </i>var.<i> mutica</i>) are very often mixed on herbarium specimens.</p><!--
 
--><p>Of conservation concern.</p>
 
--><p>Of conservation concern.</p>
 
|tables=
 
|tables=
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-->{{#Taxon:
 
-->{{#Taxon:
 
name=Selaginella weatherbiana
 
name=Selaginella weatherbiana
|author=
 
 
|authority=R. M. Tryon
 
|authority=R. M. Tryon
 
|rank=species
 
|rank=species
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|publication title=Amer. Fern J.
 
|publication title=Amer. Fern J.
 
|publication year=1950
 
|publication year=1950
|special status=
+
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/287ef3db526bd807d435a3c7423ef2df1e951227/V2/V2_770.xml
+
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V2/V2_770.xml
 
|genus=Selaginella
 
|genus=Selaginella
 
|subgenus=Selaginella subg. Tetragonostachys
 
|subgenus=Selaginella subg. Tetragonostachys
 
|species=Selaginella weatherbiana
 
|species=Selaginella weatherbiana
|2n chromosome count=18
 
|abaxial ridge prominence=prominent;prominent
 
|apex shape=bristled;keeled;keeled
 
|apical branch portion fusion=adnate;adnate
 
|apical branch portion shape=rounded
 
|base pubescence=glabrous;pubescent;glabrous
 
|base shape=decurrent;cuneate
 
|branch architecture or shape=budlike
 
|branch count=1
 
|bristle atypical some measurement=0.6mm;0.7mm
 
|bristle coloration=transparent;opaque or yellowish
 
|bristle pubescence=puberulent;smooth
 
|bristle some measurement=0.3mm;0.6mm
 
|cilium coloration=transparent
 
|cilium orientation=ascending;spreading
 
|cilium shape=denticulate
 
|cilium some measurement=0.03mm;0.06mm
 
|leaf arrangement=ranked
 
|leaf growth form=dimorphic
 
|margin architecture or pubescence or shape=short-ciliate
 
|margin shape=denticulate;short-ciliate
 
|rhizophore count=1/2
 
|rhizophore diameter=0.16mm;0.26mm
 
|sporophyll shape=narrowly ovatelanceolate;lanceolate
 
|stem architecture=rhizomatous;rhizomatous
 
|stem architecture or shape=budlike;symmetric
 
|stem fragility or size=stout
 
|stem growth form=cespitose
 
|stem location=aerial;aerial;aerial;aerial;underground
 
|stem orientation=ascending;erect
 
|stem position=lower
 
|stem shape=forked
 
|stem-leaf architecture=rhizomatous
 
|stem-leaf coloration=green
 
|stem-leaf duration=persistent
 
|stem-leaf fixation or orientation=appressed;appressed
 
|stem-leaf length=1.7mm;2.4mm
 
|stem-leaf location=aerial
 
|stem-leaf orientation=ascending;incurved;ascending
 
|stem-leaf shape=linear-lanceolate;narrowly lanceolate
 
|stem-leaf width=0.36mm;0.43mm
 
|strobilus architecture or arrangement or growth form=solitary
 
|strobilus atypical some measurement=0.7cm;1cm
 
|strobilus some measurement=1cm;3cm
 
|tip course=straight
 
 
}}<!--
 
}}<!--
  
 
-->[[Category:Treatment]][[Category:Selaginella subg. Tetragonostachys]]
 
-->[[Category:Treatment]][[Category:Selaginella subg. Tetragonostachys]]

Latest revision as of 20:25, 5 November 2020

Plants on rock, forming clumps. Stems radially symmetric, underground (rhizomatous) and aerial, not readily fragmenting, irregularly forked; rhizomatous and aerial stems often with 1 branch arrested, budlike, tips straight; aerial stems erect, less often ascending, cespitose, stout, branches not conspicuously arrested, budlike branches mostly near base. Rhizophores borne on upperside of stems, mostly restricted to rhizomatous stems or to lower 1/2 of aerial stems, 0.16–0.26(–3) mm diam. Leaves dimorphic, not clearly ranked. Rhizomatous stem leaves persistent, loosely appressed, ascending, often incurved, scalelike. Aerial stem leaves tightly appressed, ascending, green, linear-lanceolate to narrowly lanceolate, 1.7–2.4 × 0.36–0.43 mm; abaxial ridges prominent; base cuneate and decurrent on main stem or rounded and abruptly adnate on apical branch portions, glabrous or pubescent; margins short-ciliate at base, cilia transparent, spreading, denticulate, and ascending toward apex, 0.03–0.06 mm; apex keeled; bristle transparent to opaque or yellowish to brownish (on old leaves), puberulent to smooth, 0.3–0.6(–0.7) mm. Strobili solitary, (0.7–)1–3 cm; sporophylls narrowly ovate-lanceolate to lanceolate, abaxial ridges prominent, base glabrous, margins denticulate to short-ciliate, apex keeled, bristled. 2n = 18.


Habitat: Exposed or shaded granitic rock outcrops, ledges, cliffs, or in rock crevices
Elevation: 1600–3000 m

Discussion

One of the most striking features of Selaginella weatherbiana is that at branch forks the larger branch continues to grow as a vegetative shoot, and the smaller one usually forms a strobilus. Therefore, the strobili appear to be lateral rather than terminal. Selaginella weatherbiana grows in close association with S. underwoodii (R. M. Tryon 1955). The two species (as well as S. mutica var. mutica) are very often mixed on herbarium specimens.

Of conservation concern.

Selected References

None.

Lower Taxa

None.