View source for Selaginella oregana

{{Treatment/ID
|accepted_name=Selaginella oregana
|accepted_authority=D. C. Eaton in S. Watson
|publications={{Treatment/Publication
|title=in S. Watson,Bot. California
|place=2: 350. 1880
|year=1880
}}
|common_names=Oregon spike-moss
|basionyms=
|synonyms=
|hierarchy=Selaginellaceae;Selaginella;Selaginella subg. Tetragonostachys;Selaginella oregana
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Selaginellaceae]]</div><div class="higher-taxon"><small>genus</small>[[Selaginella]]</div><div class="higher-taxon"><small>subgenus</small>[[Selaginella subg. Tetragonostachys]]</div><div class="higher-taxon"><small>species</small>[[Selaginella oregana]]</div></div>
|volume=Volume 2
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>usually epiphytic, less often terrestrial, forming festoonlike mats. <b>Stems</b> radially symmetric, long-pendent, not readily fragmenting, irregularly forked, without budlike arrested branches, tips straight; main stem indeterminate, lateral branches determinate, ascending, 1-forked. <b>Rhizophores</b> borne on upperside of stems, restricted to base of pendent stems, or borne throughout on terrestrial stems, 0.13–0.2 mm diam. <b>Leaves</b> monomorphic, in alternate pseudowhorls of 4 (on main stem) and 3 (on lateral branches and secondary branches), loosely appressed, ascending, green, narrowly triangular-lanceolate to linear-lanceolate, 2–3.35 × 0.4–0.6 mm; abaxial ridges prominent, often flanked by two bands of cells (several rows wide) with whitish papillae (only in <i>S. oregana</i>, better seen on dry leaves); base cuneate and strongly decurrent on main stems and lateral branches or rounded and slightly decurrent to adnate on secondary branches, glabrous (seldom pubescent); margins entire or with very short cilia or denticulate, cilia few, transparent, scattered, ascending to slightly spreading, dentiform toward apex, 0.02–0.04 mm; apex slightly keeled, long-attenuate, short-bristled; bristle (hard to distinguish from apex) transparent or greenish transparent to yellowish or brownish (in old leaves), smooth, sometimes breaking off, (0.07–)0.17–0.4 mm. <b>Strobili</b> often paired, 1–6 cm; sporophylls lanceolate to narrowly ovate-lanceolate, abaxial ridges prominent, base glabrous, margins short-ciliate to denticulate (at middle), entire toward both base and apex, apex keeled to plane, short-bristled or merely long-attenuate.</span><!--

-->{{Treatment/Body
|habitat=Pendent on trunks and branches of mossy trees (Acer macrophyllum Pursh, Populus trichocarpa Torrey & A. Gray ex Hooker, and Alnus rubra Bongard) or on deep-shaded and moist rocky banks
|elevation=0–200 m
|distribution=B.C.;Calif.;Oreg.;Wash.
|discussion=<p><i>Selaginella oregana</i>, one of the most distinct species in the flora, is easily distinguished by its usually long, epiphytic-pendent stems, slightly loose strobili, and curled branches (in dry specimens). In the flora, <i>S. oregana</i> is most closely related to <i>S. underwoodii</i>. It is sometimes confused with <i>S. wallacei</i> (see discussion), and it shares some characteristics with the Mexican species, S. extensa L. Underwood. In <i>S. oregana</i>, very often where a branch fork occurs, one of the branches is arrested (R. M. Tryon 1955). The strobili of <i>S. oregana</i> are among the longest in the flora, and they often show several novel features. Very often the apex of a strobilus undergoes a period of vegetative growth, thus becoming a vegetative shoot, and after an interval the apex reverts to the fertile condition, forming a strobilus again. In other cases, the strobilus forks, giving rise to two new strobili.</p><!--
--><p>Of conservation concern.</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Selaginella oregana
|authority=D. C. Eaton in S. Watson
|rank=species
|parent rank=subgenus
|synonyms=
|basionyms=
|family=Selaginellaceae
|habitat=Pendent on trunks and branches of mossy trees (Acer macrophyllum Pursh, Populus trichocarpa Torrey & A. Gray ex Hooker, and Alnus rubra Bongard) or on deep-shaded and moist rocky banks
|elevation=0–200 m
|distribution=B.C.;Calif.;Oreg.;Wash.
|reference=None
|publication title=in S. Watson,Bot. California
|publication year=1880
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V2/V2_413.xml
|genus=Selaginella
|subgenus=Selaginella subg. Tetragonostachys
|species=Selaginella oregana
}}<!--

-->[[Category:Treatment]][[Category:Selaginella subg. Tetragonostachys]]