Physcomitrella.] BRYACE^. 39 



capsule sessile, large, globose, very shortly eonic-rostellate ; 

 calyptra minutely papillose : spores very large, minutely tuber- 

 culate. — Manip. Muse. ii. 411. Phascum serratuM, var. an- 

 gustifolium^ Drumm. Muse. Bor.-Am. (Coll. II.) n. 2, in part. 



Hab. Louisiana, with E. spinulosum [Drummond]. 



This species, like the two preceding, is apparently only a marked 

 variety of the polymorphous and common E. crassinernium. 



6. E. cohserens, Muell. Prothallium thin, yellowish 

 green : leaves ovate or oblong-lanceolate, denticulate above ; 

 costa effaced at base, continuous upward to the apex : cajjsule 

 subglobose with a short obtuse point, iDurplish brown. — Syn. 

 i. 32 ; Bryol. Eur. t. 1. Pliascimx cohcerens, Hedw. Sp. Muse. 

 25, t. 1, figs. 1-6 ; Sulliv. Mosses of U. States, 15. 



Hab. Clay banks along streams, common and variable. 



7. E. stenophyllum, Schimp. Leaves erect, narrowly 

 lanceolate-subulate, serrate or nearly entire at the apex ; costa 

 loosely areolate, scarcely distinct except toward the apex where 

 it passes into a short entire point ; cells chloro})hyllose. — 

 Syn. (1 ed.), 5. Phascxmi stenophyllum, Voit. PJ. sessile, 

 Muell. ; Bryol. Eur. t. 2 ; Sulliv., 1. c, 14. PJ. pallidum, 

 Schimp. Syn. (2 ed.), 5 ; recorded as sent by Sullivant in 1842. 



Hab. On clay soil, Ohio; Closter, New Jersey [Austin.). 



2. Plants with short stem,s : prothallium, none. 



3. PHYSCOMITRELLA, Schimp. 

 Stems radiculose at base. Leaves spreading or reflexed, nar- 

 rowly costate, dentate. Capsule thin, soft, globose. Calyptra 

 campanulate, fugacious, vesicular when young. 



1. P. patens, Schimp.* Plants subcespitose, pale green: 

 stem very short : leaves ovate-lanceolate, the upper obovate- 



* Aphanoregma sekratum, Sulliv., differs from this species only In 

 the regular dehiscence of the capsule, which divides in the middle and is 

 therefore considered as operculate or stegocarpous, though no decoloration 

 nor any kind of modification of texture is observable on the line of dis- 

 ruption. But for this regular dehiscence Aphanoregma should be de- 

 scribed here merely as a variety of Physcomitrella patens. It is there- 

 fore a remarkable connecting link between the Ephemerece and the 

 PhyscomitriecB, which resemble each other also in the areolation of the 

 leaves. It is from these considerations that Lindberg and some other 



