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Polytrichaceae Schwägr. Search in NYBG Virtual Herbarium Decrease font Increase font Restore font
 

Publicado en: Species Muscorum Frondosorum 1. 1830. (Sp. Musc. Frond.) Name publication detail
 

Datos del Proyecto Nombre (Last Modified On 2/20/2009)
Aceptación : Accepted
Datos del Proyecto     (Last Modified On 4/3/2009)
General Reference:

Notas     (Last Modified On 4/3/2009)
general taxon notes:

 

There are 17 genera of the Polytrichaceae in the world, and seven genera are known from China.

 

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POLYTRICHACEAE
金发藓科 jin fa xian ke
by Wu Peng-cheng and Wang Mei-zhi
 
 
Plants annual or perennial, small to robust, erect, green, brownish green to reddish brown, mostly rigid, in dense tufts, scattered or gregarious, some of them like the seedlings of conifers. Stems mostly single, rarely branched or dendroid, densely foliate at the upper portions of stems, naked or covered with scale-like leaves at the lower portions; rhizoids reddish brown or hyaline at the base of stems; rarely protonemata persistent; stoloniferous stems often present; in stem cross section epidermal cells not particularly differentiated, several rows of outer cortical cells small, thick-walled, medullar cells larger, thin-walled; central strand well developed. Leaves usually spirally arranged, erect-spreading when moist, often crisped when dry, mostly long-lanceolate or oblong-lingulate, usually broadly sheathing at base; margins entire, more often strongly toothed, single or double teeth, sometimes bordered by elongate cells; costa single, usually rather broad, percurrent to excurrent, sometimes into long subula; lamellae numerous, usually longitudinally arranged on the ventral surface of costae, sometimes lamellae or spines present on the dorsal surface, without lamellae at sheathing bases and at margins; leaf cells rounded oval, nearly quadrate or irregularly hexagonal, smooth or papillose, thin-walled or thick-walled, cells at sheathing base quadrate to rectangular, mostly hyaline, sometimes yellowish brown. Dioicous or rarely autoicous. Male plants often smaller than female ones. Perigonia terminal, discoid, sometimes the new innovations growing on perichaetia. Female plants rather large. Setae elongate, smooth; capsules terminal or lateral, mostly oblong-ovoid to cylindrical or 4–6-angular, rarely ovoid, spherical or pyriform, smooth or papillose, sometimes slightly inflected, stomata at base of neck; opercula acute or rostrate from a conic base; columella sometimes extended into membrane and connected with peristome teeth and closing the mouth of capsules; annuli not differentiated; peristome single, often consisting of 32 or 64 teeth, rarely 16 or absent, mostly lingulate, connected at their base. Calyptrae cucullate, long conic or campanulate, densely covered with pale, light yellow, golden yellow or reddish hairs, rarely smooth or small spinulose, surrounding the whole capsule or only on its upper portion. Spores spherical or oval, papillose.
 

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Key to genera (with sporophytes)
 
1. Plants with umbrella-like branches..............................................................................3. Microdendron
1. Plants without umbrella-like branches...................................................................................................2
2. Capsules oblate-ovoid................................................................................................2. Lyellia
2. Capsules globose, cylindrical, or cylindrical with several obtuse keels...................................................... 3
3. Leaf margins bi-toothed; capsules cylindrical, slightly curved.........................................1. Atrichum
3. Leaf margins entire or single-toothed; capsules thickly cylindrical, not curved..........................................4
4. Leaf ventral lamellae in less than 10 rows; costa slender; calyptrae almost smooth........ 4. Oligotrichum
4. Leaf ventral lamellae usually in more than 15 rows; costa rather broad; calyptrae densely ciliate........... 5
5. Capsules oblong-cylindrical to cylindrical, not angled..............................................5. Pogonatum
5. Capsules cubic or prismatic, clearly angled......................................................................................6
6. Mouths of capsules closed by fleshy membrane......................................................6. Polytrichastrum
6. Mouths of capsules closed by thin membrane..........................................................7. Polytrichum
 
Key to genera (without sporophytes)
 
1. Plants with umbrella-like branches above...................................................................3. Microdendron
1. Plants without umbrella-like branches above......................................................................................2
2. Ventral lamellae of leaves only on narrow costa, less than 10 rows......................................................3
2. Ventral lamellae of leaves on rather broad costa, more than 15 rows...................................................4
3. Leaves thin, delicate, usually crisped when dry, leaves almost equal width throughout, undulate, with spines numerous on the back.............................................................................................1. Atrichum
3. Leaves rather thick, only slightly twisted when dry, leaves clearly broader below the midleaf, not undulate, only with a few spines on the back........................................................................... 4. Oligotrichum
4. Lamellae usually 6 or more cells high..............................................................................................5
4. Lamellae 1–6 cells high..................................................................................................................6
5. Leaf apices aristate or narrow; leaf margins involute, marginal cells linear; apical cells of lamellae usually not papillose.....................................................................................................................7. Polytrichum
5. Leaf apices not aristate, mostly lanceolate; leaf margins not involute, marginal cells shorter; apical cells of lamellae smooth or papillose.......................................................................................6. Polytrichastrum
6. Leaves crisped; marginal teeth single; marginal cells of lamellae single...................................... 2. Lyellia
6. Leaves usually twisted only, rarely crisped; marginal teeth double or single; marginal cells of lamellae twin or single, rarely differentiated......................................................................................... 5. Pogonatum

 

 
 
 
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