C90 HKPATICJS. (liverworts.) 



4. A. misltiflclst, Dumort. Fronds prostrate, 2-pinnately divided; the 

 divisions linear, narrow ; whole plant brownish-green. — Alleghany Mountains, 

 on moist, rocky banks. (Eu.) 



15. STEETZIA, Lehm. (Tab. 20.) 



Involucre at first terminal, arising from the midrib of the frond, at length by 

 the growth of the frond dorsal, cup-shaped, short, lacerate. Perianth elongated- 

 tubular; the mouth denticulate. Calyptra equalling the perianth, irregularly 

 torn at the apex. Capsule oval. Elaters filiform, free, with two fibres. Inflo- 

 rescence dioecious. Antheridia dorsal on the midrib, covered by minute fimbri- 

 ated perigonial leaves. Frond with a distinct midrib. (Named for Dr. J. Steelz, 

 a German botanist.) 



1. §. Liyellii, Lehm. Frond simple or 2-cleft, delicate in texture, oblong- 

 linear, the margin slightly waved, entire or obscurely serrate (l'-4' long, 3" - 

 5" wide). — On the ground, in wet or springy places. (Tab. 20.) (Eu.) 



16. PELLIA, Raddi. (Tab. 21.) 



Fructification proceeding from the back of the frond near the apex. Involu- 

 cre cup-shaped, short; the margin lacerate. Perianth none. Calyptra oval, 

 membranaceous, longer or shorter than the involucre. Capsule globose. Ela- 

 ters long, free, with two fibres. Inflorescence monoecious. Antheridia globose, 

 immersed in the upper surface of the broad indeterminate midrib of the frond. 

 (A personal name.) 



1. P. epipliylla* Nees. Frond rather membranaceous, sparingly di- 

 vided ; its divisions oblong, somewhat wedge-shaped, repand-lobed ; calyptra 

 exserted. — Moist, shady places, on the ground, forming patches 2° -3° broad. 

 (Tab. 21.) (Eu.) 



17. BLASIA, Mich. (Tab. 21.) 



Fructification in an oval cavity in the midrib of the frond. Involucre none. 

 Perianth a fusiform utricle, vanishing early. Calyptra obovate. Capsule oval- 

 globose, bursting through the frond near its apex. Antheridia immersed in the 

 frond and covered by dentate scales. Gemma? globose, issuing by a slender as- 

 cending tube from their large flask-like receptacles, which are immersed in the 

 frond. — (A personal name.) 



1. B. pusilla, L. Frond 7" -12" long, 2" -3" wide, linear-obovate, 

 simple or forked, or stellately expanded, the margins pinnatifidly sinuous. — On 

 the ground, sides of ditches, &c, New York. (Tab. 21.) (Eu.) 



II. Vegetation foliaceous (i. e. leaves and stem distinct). 

 * Leaves succubous ; the apex of each leaf lying under the base of the next. 



18. FOSSOMBBONIA, Raddi. (Tab. 21.) 



Perianth terminal, or by innovation dorsal on the main stem, subcampanulate ; 

 She mouth large, crenate-lobed. Involucral leaves 5-6, minute, subulate, co- 



