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!!Atrichum P. Beauv.

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Published In: Magasin Encyclopédique 9(5[19]): 329. 1804. (21 Feb 1804) (Mag. Encycl.)

Project Name Data (Last Modified On 4/3/2009)

Acceptance : Accepted

Project Data (Last Modified On 4/3/2009)

General Reference:

Wu, P.-C., M. R. Crosby & S. He. 2005. Sematophyllaceae–Polytrichaceae. 8: viii + 385 pp. In Moss Fl. China. Science Press & Missouri Botanical Garden, Beijing, New York & St. Louis.

Notes (Last Modified On 4/3/2009)

general taxon notes:

The genus consists of some 20 species in temperate regions of the world. Six species are known in China.

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1. Atrichum P. Beauv. 仙鹤藓属 xian he xian shu

Mag. Encycl. 5: 329. 1804. Polytrichum subgen. Atrichum (P. Beauv.) Wilson in Hook., Fl. Nov.-Zel. 2: 94. 1854. Callibryon Zenk. & Dietr., Musci Thur. 11: 41. 1822, nom. illeg. Catharinea Ehrh. ex Web. & Mohr, Observ. Bot. 31. 1803.

Plants small to medium-sized, rigid, erect, green, dark green or brownish green, usually in loose tufts. Stems single or rarely branched; rhizoids often numerous at base; central strand developed. Leaves lanceolate or lingulate, acuminate or acute, often obliquely undulate, spines obliquely arranged on leaf back, strongly curved or crisped when dry, erect-patent when moist, loosely or densely foliate on stems above; leaf cells usually smooth, median cells mostly rounded quadrate or hexagonal, lower cells rectangular; margins bordered by 1–3 rows of elongate or linear cells, often double-toothed; costa single, reaching leaf apex or excurrent; lamellae only growing on the ventral surface of the costa, usually consisting of uniform cells. Dioicous, rarely monoicous. Setae slender, erect; capsules single or tufted, cylindrical, erect or slightly vaulted, apophyses small or undeveloped; peristome teeth single, 32, reddish brown, keeled; opercula conic, long beaked. Calyptrae cucullate. Spores yellowish green, minutely papillose.

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1. Plants usually less than 1.5 cm high; leaf lamellae rudimentary, only 1–2(–3) cells high or sometimes absent

............................................................................................................................ 6. A. yakushimense

1. Plants usually higher than 1.5 cm; leaf lamellae often well developed, 2–7 cells high...............................2

2. Median leaf cells mostly smaller than 16 µm in diameter.......................................................................3

2. Median leaf cells usually larger than 18 µm in diameter........................................................................4

3. Leaf lamellae usually in 5–10 rows and 5–11 cells high..........................................1. A. angustatum

3. Leaf lamellae usually in 4–5(–6) rows and 2–5(–7) cells high..................................3. A. rhystophyllum

4. Leaf lamellae usually in 2–4(–6) rows, 2–3 cells high; leaf cells mostly hexagonal........ 2. A. crispulum

4. Leaf lamellae usually in 4–5 rows, mostly more than 3 cells high; leaf cells not hexagonal.................... 5

5. Leaf apices obtuse; median leaf cells not in longitudinal rows; cell walls thin.................... 4. A. subserratum

5. Leaf apices acute; median leaf cells clearly in longitudinal rows; cell walls rather thick..................................

..................................................................................................5. A. undulatum var. gracilisetum

Lower Taxa

!Atrichum angustatum (Brid.) Bruch & Schimp.
!Atrichum crispulum Schimp. ex Besch.
!Atrichum rhystophyllum (Müll. Hal.) Paris
!Atrichum subserratum (Harv. & Hook. f.) Mitt.
!Atrichum yakushimense (Horik.) Mizush.

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