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Racomitrium lanuginosum (Hedw. ) Brid.
Trichostomum lanuginosum

Life   Plantae   Bryophyta   Grimmiaceae   Racomitrium

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

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Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum

Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
Racomitrium lanuginosum
© Copyright Malcolm Storey 2011-2118 · 3
Racomitrium lanuginosum
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Following modified from Taiwan Biodiversity National Information Network
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Kingdom Plantae  
 Phylum Bryophyta  
 Class Bryopsida  
 Order Grimmiales  
 Family Grimmiaceae  
 Genus Racomitrium  
  Racomitrium lanuginosum    (Hedw.) Bird., 1819[1818] 
Provider: Chiang, Tzen-Yuh 
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Synonyms: Grimmia glacialis Grimmia hypnoides Grimmia rigidissima Racomitrium glaciale Racomitrium hypnoides Racomitrium incanum Racomitrium lanuginosum pruinosum Racomitrium lanuginosum subimberbe Racomitrium leptodontioides   details
Citation: Bell, B. G. 1974. A synoptic flora of South Georgian mosses. V. Willia and Racomitrium. Brit. Antarct. Surv. Bull. 38: 73–101. Wijk, R. van der, W. D. Margadant & P. A. Florschütz 1962. Index Muscorum. 2(D–Hypno). Regnum Veg. 26. 535 pages. Wijk, R. van der, W. D. Margadant & P. A. Florschütz 1967. Index Muscorum. 4(P–S). Regnum Veg. 48. 604 pages.
Name Code: 200341
  
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Following modified from Plants Database, United States Department of Agriculture
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http://plants.usda.gov/java/profile?symbol=RALA70 ---> https://plants.usda.gov/java/profile?symbol=RALA70
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Following modified from Flora of North America
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FNA Vol. 27 Page 32, 290 , 294 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 27 | Grimmiaceae | Racomitrium

1. Racomitrium lanuginosum (Hedwig) Bridel, Muscol. Recent., suppl. 4: 79. 1818.

Trichostomum lanuginosum Hedwig, Sp. Musc. Frond., 107. 1801

Plants forming dark or grayish to yellowish green, yellowish to blackish brown tufts or patches, usually hoary when dry. Stems to 15 cm or more, radiculose at the base or not. Leaves crowded, erect-appressed when dry, erectopatent when wet, straight to falcate-secund, linear-lanceolate, 3-5 × 0.6-0.9 mm; margins recurved to revolute for 1 /2- 2 /3 the leaf length, entire proximally the echlorophyllose part formed by decurrencies from the awn; apices gradually tapering to a long and slender awn, not decurrent, canaliculate distally, concave to broadly carinate proximally, awn hyaline, densely papillose, broadly and evenly decurrent to 1 /4- 1 /3 along the margins, with decurrencies consistently flat, erosodentate to nearly entire and short, to 30 µm, sharp or blunt teeth, distinctly papillose throughout, spreading at a 40-90º angle; costa in tranverse-section rectangular to reniform in outline, strongly convex abaxially, 75-100 µm wide basally; basal laminal cells long-rectangular, 40-90 × 7-8 µm, strongly nodulose, forming a broad orange strip along the insertion; medial cells becoming long-rectangular to linear, 50-60 × 6-8 µm wide; distal laminal cells short-rectangular, (10-)15-40 × 7-9 µm. Seta 1-3 per perichaetium, brown to reddish brown, 3-7(-10) mm, erect, flexuose. Capsule brown, 1-1.7 mm, smooth, glistening; peristome teeth (300-)500-700(-900) µm, reddish brown, arising from a low basal membrane, 2-fid almost to the base into filiform, terete, densely spiculate-papillose divisions. Spores 8 - 12 µm.

Dry, exposed areas, mostly with high light intensity, acidic or seldom calciferous soil and rocks, boulders, cliffs, ledges, scree and in fellfields, polar tundra and tundra-like barrens in mountains, hummocks in peatland and moorland, over raw earth of bog margins; low to high elevations (0-2300 m); Greenland; Alta., B.C., Man., Nfld. and Labr., N.W.T., N.S., Nunavut, Ont., Que., Yukon; Alaska, Calif., Idaho, Maine, Mont., N.H., Oreg., Wash.; Central America (Costa Rica); South America (Argentina, Chile, Colombia, Ecuador, Peru); Europe; arctic and temperate Asia (including Borneo, Java, New Guinea, Sumatra); South Africa; Atlantic Islands (Azores, Canary Islands, Falkland Islands, Gough Island, Iceland, Madeira, South Georgia, Tristan da Cunha); Indian Ocean Islands (Heard Island, Îles Crozet, Îles Kerguelen, Prince Edward Islands, Réunion); Pacific Islands (Hawaiian Islands, New Zealand); Australia; Antarctica (Deception Island).

Racomitrium lanuginosum is widely distributed throughout the Nearctic and Greenland, where it reaches the highest possible latitudes, becoming rare and scattered southwards. It usually occupies habitats of varying moisture regimes, but exhibits a tendency for growing in exposed, dry, and insolated situations. The often extensive and tumid patches of it found on rocks and soil are mostly hoary when dry. This is due to the very long hyaline awns that at once separate it from all other species of the broadly conceived Racomitrium . The shape of the hair-points is unique not only in the Grimmiaceae but among the mosses. Niphotrichum species often have a similar hoary appearance due to their long, papillose, hair-pointed leaves, but they differ from R. lanuginosum in having non-decurrent awns and tall, stout, conical papillae distributed over the leaf cell lumina, as well as large and often decurrent hyaline alar cells.

The laminal papillae of Racomitrium lanuginosum are identical to those of the genus Codriophorus , but species of that genus are usually readily distinguished by their muticous leaves. The only exception is C. varius , which often has pilose leaves but the awns are non-decurrent, smooth to faintly denticulate, and never papillose. Moreover, it has long-cylindric capsules, smooth setae, and very long, 1-1.8 mm peristome teeth, but in general sporophytes are produced infrequently in R. lanuginosum .

Following modified from CalPhotos
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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Racomitrium+lanuginosum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Racomitrium+lanuginosum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant
&pull 20q v4.662 20091102: Error 501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Racomitrium+lanuginosum&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

Updated: 2018-05-25 00:30:16 gmt
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