Difference between revisions of "Ptychostomum longisetum"
Phytologia 87: 21. 2005.
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| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Bryum longisetum | |name=Bryum longisetum | ||
|authority=Blandow ex Schwägrichen | |authority=Blandow ex Schwägrichen | ||
| + | |publication_title=Sp. Musc. Frond. Suppl. | ||
| + | |publication_place=1(2): 105, plate 74 [bottom]. 1816 | ||
}} | }} | ||
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|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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V28/V28_256.xml |
|genus=Ptychostomum | |genus=Ptychostomum | ||
|subgenus=Ptychostomum subg. Cladodium | |subgenus=Ptychostomum subg. Cladodium | ||
Revision as of 19:45, 24 September 2019
Plants in dense or open turfs, green or yellow-green. Stems 1–2(–3) cm, comose, innovations comose or somewhat elongate and evenly foliate; not strongly radiculose. Leaves green or yellow-green, twisted to contorted when dry, ovate to broadly ovate-lanceolate, weakly concave, 1–2(–3) mm, enlarged toward stem apex; base not or weakly decurrent; margins revolute to mid leaf or beyond, limbidium strong, in 2 or 3 rows; apex acute; costa short-excurrent, awn recurved, denticulate; proximal laminal cells 3–4:1, same width or sometimes wider than more distal cells; medial and distal cells rhomboidal, 12–18 µm wide, 2–3:1, walls usually thin to firm. Specialized asexual reproduction absent. Sexual condition synoicous. Seta 3–6(–8) cm. Capsule brown, elongate-pyriform, symmetric, 2–4 mm, mouth yellow; operculum conic, apiculate; peristome well developed; exostome teeth yellow basally, hyaline distally, lamellae usually straight mid tooth, pores absent along mid line; endostome not adherent to exostome, basal membrane high, less than 1/2 exostome height, segments with broadly ovate perforations, cilia short, rudimentary. Spores variable in size, (38–)40–50 µm, finely papillose, pale yellow-brown or green.
Phenology: Capsules mature Jun–Sep.
Habitat: Damp soil in wetlands
Elevation: low to moderate elevations (0-600 m)
Distribution
Greenland, Nfld. and Labr., N.W.T., Nunavut, Yukon, Alaska, Eurasia.
Discussion
Ptychostomum longisetum is a circumpolar arctic-boreal species related to P. inclinatum. Gametophytically it is similar to P. intermedium and P. salinum but differs in the extremely long seta and very large spores.
Selected References
None.