CALYMPERACEAE. 



437 



1. Syrrhopodon floridanus Sull. 

 Florida Sykrhopodon. (Fig. 477.) 

 Plants about 1' high, forming large 

 dense, dark green cushions; stems 

 simple or branching, rooting at base, 

 with crowded leaves, which are curled 

 and twisted when dry, spreading when 

 moist, with a conspicuous broad white 

 base and narrower, dense, dark green 

 apex; margins double and serrate; 

 basal cells hyaline, upper cells and 

 back of vein densely papillose, some- 

 times bearing dense clusters of brood- 

 bodies, by which this species propa- 

 gates. 



At base of palmetto in marshes. 

 Southern United States and Cuba. 



Family 5. POTTIACEAE Bruch & Schimp. 



PoTTiA Family. 



Plants small, or large, growing in more or less crowded cushions; 

 stems usually erect, short and simple or branching, not tomentose; leaves 

 crowded, spreading often twisted when dry, of various shapes ; vein single, 

 percurrent or excurrent into an awn; cells of the basal part of the leaf 

 often larger and clearer than those of the apical, which are usually 

 denser and often papillose. Pedicel sometimes ver\^ short, mostly elongate 

 and erect; capsule erect, usually straight, seldom inclined; calyptra cucul- 

 late; lid conic and beaked; peristome single, rarely lacking, occasionally 

 with a deep basal membrane, teeth 16 or 32, often papillose, sometimes 

 bifid and spirally twisted. A large family of 46 genera and 396 species. 



Leaves much curled and twisted when dry, margins incurved ; peristome short 

 straight or lacking. 



Leaf-margins entire ; teeth 16, entire or irregularly divided 



Leaf-margins entire ; teeth 16, split or bifid. 

 Leaves only slightly curved or bent when dry. 



A. Peristome short. 

 Leaf-margins toothed at base. 

 Leaf-margins finely crenulate, toothed above. 



B. Peristome none. 



C. Peristome long, twisted. 



1. Wcisia. 



2. TrUliostomum. 



3. Euchidium. 



4. OyroHcisia. 



5. Hymcnosti/lium. 



6. Tortilla. 



1. WEISIA Hedw. 



Plants small, crowded; stems erect, with branches; leaves much curled 

 and twisted when dry, mostly subulate-lanceolate with incurved margins; vein 

 ending in the sharp apex; cells rectangular and clear at base, rounded and 

 small above, papillose on both sides above. Seta erect, slender; capsule erect, 

 ovoid or cylindric, ribbed when dry; peristome single, inserted below the 

 mouth; teeth 16, irregular and papillose, or rarely short and rudimentary. 

 [Named for F. W. Weis.] A small genus widely distributed in temperate 

 regions. Type species: Bryum viridulum L. 



