84 BRYACEiE. [Fissidens. 



Comparable to F. osmundoides, Hedw., from which it differs in the 

 monoecious inflorescence, the serrulate apex of the leaves, and the minute 

 hexagonal areolatiou. 



8. F. ventricosus, Lesq. Plants robust, loosely and 

 widely cespitose, nearly black throughout, dark green only at 

 the top of the recent innovations, generally immersed; stems 

 two cm. long or more, branching from the base, radiculose in 

 the axils of the leaves : leaves close, erect-open, cultriform, pli- 

 cate and venti'icose to the middle, bordered by a thick smooth 

 margin confluent at the apex with the tihick costa, which is ex- 

 current into a blunt point or rarely vanishing below it ; areola- 

 tion minute, ovate-quadrate or irregularly polygonal: flowers 

 terminal : calyptra large, cucullate : cajasule very shortly pedi- 

 cellate, subimmersed, erect, obovate, narrowing and confluent 

 into the pedicel, dark green ; lid short, conical, obtuse ; teeth 

 large, erect : spores large. — Mem. Calif. Acad. i. 7 ; Sulliv. Icon. 

 Muse. Suppl. 45, t. 30. 



Hab. On submerged rocks, Mendocino City, California (Bolander). 

 Species comparable to F. rufulus, Bruch & Schimp., from which it 

 differs in the more obtuse thick-margined leaves, etc. 



* * Floicers dioecious. 

 +- Plants niimite. 



9. F. hyalinus, Wils. & Hook. Gregarious; stems 2 or 3 

 m.m. long, simple: leaves 3 or 4 pairs, very soft, oblong- 

 lanceolate, interruptedly narrowly marginate, ecostate, plicate 

 to the middle, with a broad margin gradually narrowed to the 

 base ; meshes of the areolation large, hexagonal, hyaline- 

 pellucid : fertile flowers terminal, the male not seen : calyptra 

 subcylindrical, covering the beak of the lid : capsule oblong, 

 erect, enlarged at the orifice, short-pedicellate ; teeth reddish, 

 solid, closely articulate. — Journ. Bot. (1841) iii. 89, t. 2; Sulliv. 

 Muse. Alleghan. n. 180, Mosses of U. States 24, and Icon. Muse. 

 34, t. 21. 



Hab. Moist rocky ledges at Bank Lick, near Cincinnati (T. G. Lea); 

 clay banks near Painesville, OlMp (//. C. Beardslee); very rare. 



10. F. exigUUS, Sulliv. Gregarious, pale green : leaves 

 4 to 6 pairs, oblong-lanceolate, obscurely short-acuminate, entire, 

 not margined, plicate to the middle ; dorsal h^.mina gradually 

 narrowed and vanishing at base ; costa flexuous, siibpercurrent : 

 male and female plants similar : flowers termmal : capsule erect, 



