Difference between revisions of "Ditrichum heteromallum"
in N. L. Britton et al., N. Amer. Fl. 15: 64. 1913,.
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|name=Didymodon homomallus | |name=Didymodon homomallus | ||
|authority=Hedwig | |authority=Hedwig | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Ditrichum homomallum | |name=Ditrichum homomallum | ||
|authority=(Hedwig) Hampe | |authority=(Hedwig) Hampe | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Ditrichum zonatum | |name=Ditrichum zonatum | ||
|authority=(Bridel) Kindberg | |authority=(Bridel) Kindberg | ||
| − | }}{{Treatment/ID/Synonym | + | }} {{Treatment/ID/Synonym |
|name=Ditrichum zonatum var. scabrifolium | |name=Ditrichum zonatum var. scabrifolium | ||
|authority=Dixon | |authority=Dixon | ||
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|elevation=low to high elevations (50-1500 m or higher) | |elevation=low to high elevations (50-1500 m or higher) | ||
|distribution=B.C.;Alaska;Oreg.;Wash.;South America (Colombia);Europe;Asia (China;Japan;Taiwan);Atlantic Islands (Iceland). | |distribution=B.C.;Alaska;Oreg.;Wash.;South America (Colombia);Europe;Asia (China;Japan;Taiwan);Atlantic Islands (Iceland). | ||
| − | |discussion=<p>Rhizoidal tubers were first reported for Ditrichum heteromallum by S. Risse (1985) from European material and have also been noted in Japanese material by H. Deguchi and T. Matsui (1986). They have the appearance of short filaments with swollen, contorted rhizoid cells. Ditrichum zonatum (Bridel) Kindberg, including the var. scabrifolium Dixon, appears to be only a small form of D. heteromallum with shorter, appressed leaves that are often more 2-stratose, especially near the base, and leaf cells that are sometimes papillose at the ends. We have not seen specimens that support the Wisconsin report by F. Bowers and S. Freckman (1979) and believe the record to be dubious.</p> | + | |discussion=<p>Rhizoidal tubers were first reported for <i>Ditrichum heteromallum</i> by S. Risse (1985) from European material and have also been noted in Japanese material by H. Deguchi and T. Matsui (1986). They have the appearance of short filaments with swollen, contorted rhizoid cells. <i>Ditrichum</i> zonatum (Bridel) Kindberg, including the var. scabrifolium Dixon, appears to be only a small form of <i>D. heteromallum</i> with shorter, appressed leaves that are often more 2-stratose, especially near the base, and leaf cells that are sometimes papillose at the ends. We have not seen specimens that support the Wisconsin report by F. Bowers and S. Freckman (1979) and believe the record to be dubious.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V27/V27_654.xml |
|genus=Ditrichum | |genus=Ditrichum | ||
|species=Ditrichum heteromallum | |species=Ditrichum heteromallum | ||
Revision as of 16:56, 18 September 2019
Plants in loose to dense tufts, yellowish green. Stems to 1 cm, simple, seldom branched. Leaves 1.5–3 mm, erect-spreading, sometimes slightly secund, from an ovate to oblong base tapering gradually to a long channelled subula, lamina 2-stratose distally; margins plane, 1-stratose proximally, 2-stratose in the middle to distal parts; costa broad, occupying most of the subula, in section with a distinct abaxial and poorly developed adaxial stereid band; cells of subula and distal lamina elongate-rectangular, longer in the leaf base, smooth or sometimes papillose at both ends, especially near leaf apices. Specialized asexual reproduction by rarely produced rhizoidal tubers. Sexual condition dioicous. Seta reddish brown, 1–2.5 mm. Capsule erect, reddish brown, oblong to cylindric, symmetric, 0.5–1.5 mm; peristome teeth pale orange, about 300 µm, lightly papillose; operculum conic-rostrate, blunt, 0.4–0.5 mm. Spores 10–15 µm, finely papillose.
Phenology: Capsules mature summer (Jun–Aug).
Habitat: Soil
Elevation: low to high elevations (50-1500 m or higher)
Distribution
B.C., Alaska, Oreg., Wash., South America (Colombia), Europe, Asia (China, Japan, Taiwan), Atlantic Islands (Iceland).
Discussion
Rhizoidal tubers were first reported for Ditrichum heteromallum by S. Risse (1985) from European material and have also been noted in Japanese material by H. Deguchi and T. Matsui (1986). They have the appearance of short filaments with swollen, contorted rhizoid cells. Ditrichum zonatum (Bridel) Kindberg, including the var. scabrifolium Dixon, appears to be only a small form of D. heteromallum with shorter, appressed leaves that are often more 2-stratose, especially near the base, and leaf cells that are sometimes papillose at the ends. We have not seen specimens that support the Wisconsin report by F. Bowers and S. Freckman (1979) and believe the record to be dubious.
Selected References
None.