Difference between revisions of "Pylaisia"
in P. Bruch and W. P. Schimper, P. Bruch and W. P. Schimper, Bryol. Europ. 5: 87, plate 455. 1851.
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|accepted_name=Pylaisia | |accepted_name=Pylaisia | ||
| − | |accepted_authority= | + | |accepted_authority=Schimper |
|publications={{Treatment/Publication | |publications={{Treatment/Publication | ||
| − | |title=P. Bruch and W. P. Schimper, Bryol. Europ. | + | |title=in P. Bruch and W. P. Schimper, P. Bruch and W. P. Schimper, Bryol. Europ. |
|place=5: 87, plate 455. 1851 | |place=5: 87, plate 455. 1851 | ||
|year=1851 | |year=1851 | ||
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name=Pylaisia | name=Pylaisia | ||
|author=Tomotsugu Arikawa | |author=Tomotsugu Arikawa | ||
| − | |authority= | + | |authority=Schimper |
|rank=genus | |rank=genus | ||
|parent rank=family | |parent rank=family | ||
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|distribution=North America;Mexico;Central America;South America (Andes Mountains);Europe;Asia. | |distribution=North America;Mexico;Central America;South America (Andes Mountains);Europe;Asia. | ||
|reference=arikawa2004a | |reference=arikawa2004a | ||
| − | |publication title=P. Bruch and W. P. Schimper, Bryol. Europ. | + | |publication title=in P. Bruch and W. P. Schimper, P. Bruch and W. P. Schimper, Bryol. Europ. |
|publication year=1851 | |publication year=1851 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V28/V28_879.xml |
|genus=Pylaisia | |genus=Pylaisia | ||
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-->[[Category:Treatment]][[Category:Hypnaceae]] | -->[[Category:Treatment]][[Category:Hypnaceae]] | ||
Latest revision as of 22:38, 5 November 2020
Plants small, in low mats, yellowish to whitish, shiny. Stems creeping, regularly or irregularly pinnate, branches usually strongly curled when dry; hyalodermis absent, central strand present, small; pseudoparaphyllia foliose. Stem and branch leaves similar. Stem leaves appressed when dry, erect-spreading when moist, ovate-lanceolate, widest beyond base, not or slightly plicate; base not or weakly decurrent; margins plane, sometimes slightly involute distally, subentire to serrulate distally; apex acuminate; costa double and short or indistinct; alar cells differentiated, subquadrate to rectangular; laminal cells smooth; distal cells usually longer than 6:1. Branch leaves narrowly ovate- to oblong-lanceolate, smaller to occasionally somewhat larger than stem leaves. Specialized asexual reproduction absent. Sexual condition autoicous; inner perichaetial leaves erect, oblong-lanceolate, apex subulate. Seta yellowish or reddish. Capsule erect to suberect, oblong-cylindric to oblong-ovoid, straight, not contracted below mouth; annulus differentiated or not; operculum conic to rostrate, obliquely short- to long-acute or obtuse; peristome perfect to reduced, hygroscopic; exostome teeth with external surface smooth basally, sometimes roughly papillose distally; endostome basal membrane present, segments sometimes 2-fid or fragmentary, keeled, cilia rudimentary. Calyptra naked. Spores spheric [somewhat tetrapozoidal by endosporic protonemata], finely papillose.
Distribution
North America, Mexico, Central America, South America (Andes Mountains), Europe, Asia.
Discussion
Species 16 (4 in the flora).
Pylaisia has yellowish brown stems 2 cm long and reddish capsules; the exothecial cell walls are thin. The setae are sinistrorse-twisted basally and dextrorse-twisted distally when dry; the capsules have few phaneropore stomata on the base of the neck; and the exostome teeth are lance-subulate to blunt, distinctly lamellate, and internally trabeculate.
Selected References
Key
| 1 | Endostome free, segments neither 2-fid nor perforate; spores usually smaller than 16 µm; stem leaves usually longer than 1.3 mm | > 2 |
| 1 | Endostome wholly or partially adherent to exostome teeth, segments split, 2-fid; spores usually larger than 16 µm; stem leaves usually shorter than 1.2 mm | > 3 |
| 2 | Branches subjulaceous; stem and branch leaves slightly differentiated; alar cells 8-10 along margins; endostome 0.3 mm beyond mouth. | Pylaisia polyantha |
| 2 | Branches ± complanate-foliate, partly subjulaceous; stem and branch leaves well differentiated; alar cells 10-15 along margins; endostome 0.4-0.5 mm beyond mouth. | Pylaisia steerei |
| 3 | Endostome free distally; stems regularly pinnate; alar cells 20-25 along margins. | Pylaisia selwynii |
| 3 | Endostome wholly adherent; stems irregularly pinnate; alar cells 6-12 along margins. | Pylaisia intricata |