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Atrichum undulatum (Hedw.) P. Beauv.
Life   Plantae   Bryophyta   Polytrichaceae   Atrichum

Atrichum undulatum
© Copyright Malcolm Storey 2011-2118 · 3
Atrichum undulatum

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Atrichum undulatum
© Copyright Malcolm Storey 2011-2118 · 3
Atrichum undulatum
Atrichum undulatum
© Copyright Malcolm Storey 2011-2118 · 3
Atrichum undulatum

Atrichum undulatum
© Copyright Malcolm Storey 2011-2118 · 3
Atrichum undulatum
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Following modified from Taiwan Biodiversity National Information Network
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Kingdom Plantae  
 Phylum Bryophyta  
 Class Bryopsida  
 Order Polytrichales  
 Family Polytrichaceae  
 Genus Atrichum  
  Atrichum undulatum    (Hedw.) P. Beauv., 1805 
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Synonyms: Atrichum haussknechtii Catharinea callibryon Catharinea ehrhartii Catharinea flavilimbata Catharinea longemitrata Polytrichum undulatum   details
Citation: Corley, M. F. V., A. C. Crundwell, R. Düll, M. O. Hill & A. J. E. Smith 1981 [1982]. Mosses of Europe and the Azores: an annotated list of species, with synonyms from the recent literature. J. Bryol. 11: 609–689. Flora of North America Editorial Committee, 2007. Bryophytes: Mosses. Fl. N. Amer. 27(1): i–xxi, 1-711. Wijk, R. van der, W. D. Margadant & P. A. Florschütz 1959. Index Muscorum. 1(A–C). Regnum Veg. 17. xxviii + 548 pages. 高謙, 賴明洲 2003, 中國苔蘚植物圖鑑
Name Code: 201039
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Following modified from Plants Database, United States Department of Agriculture
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Following modified from Flora of North America
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FNA Vol. 27 Page 24, 25, 38, 131, 148, 149, 151, 152, 154 , 155 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 27 | Polytrichaceae | Atrichum

8. Atrichum undulatum (Hedwig) P. Beauvois, Prodr. Aethéogam. 42. 1805.

Polytrichum undulatum Hedwig, Sp. Musc. Frond., 98. 1801

Plants small to fairly large, dark green. Stems 2-5 cm. Leaves sparse below, more crowded above, 4-9 × 0.8-1.5 mm, lingulate to lanceolate, undulate, keeled distally, concave to flat proximally, with oblique rows of abaxial teeth on undulations, the apex acute; costa percurrent, with teeth on abaxial surface in distal half; lamellae 2-6, 2-4(-7) cells high; median leaf cells 20-32 µm wide, irregularly angled to hexagonal, sometimes rounded, often transversely elongate, convex on both surfaces, smooth or with minute, verrucose or striate papillae on abaxial surface, walls firm, strongly collenchymatous with trigones. Sexual condition polygamous, some shoots bisexual, others apparently male or female; perigonial bracts broad, forming antheridial buds, often several buds per plant. Seta 1(-3) per perichaetium, 1-3 cm, reddish brown. Capsule 2-4(-8) × 0.5-1 mm, curved to distinctly arcuate, almost horizontal; operculum 2-3 mm. Spores ( 12-)16-28 µm.

Capsules mature spring-summer (Apr- Jul). Soil, dry weedy habitats, especially roadside ditches; usually low elevations; introduced; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I.; Maine; Europe; w, c Asia; n Africa.

No Atrichum species occurring in North America has been as widely misunderstood as A. undulatum . Evidently introduced from Europe, its weedy habitat and strongly arcuate, almost horizontal capsules are the surest means of recognition. Variety minus , a fixture of European manuals, is a stunted form that is highly variable and possibly a hybrid. Its occurrence in North America has not been demonstrated. As used by American authors (e.g., O. E. Jennings 1951), it probably refers to A. altecristatum .

Updated: 2018-05-27 16:01:01 gmt
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