688 HEPATIC^. (LIVERWORTS.) 



cious. Antheridia immersed in imbedded disks at the apex of the firm and rigid 

 keeled frond. (Named for D. Grimaldi, an Italian botanist.) 



1. Cr. b&rbifrons, Bischoff. Stems linear-wedge-shaped, 3" -6" long, 

 subdichotomous, 2-lobed at the apex, channelled and pale green above, with 

 whitish pores visible to the naked eye, purple beneath ; peduncle profusely palea- 

 ceous at its base and apex ; monoecious ; staminate disks obcordate. — Iowa, 

 Dr. Hor. (Tab. 21.) (Eu.) 



2. Cr. sessilis, n. sp. Agrees with the preceding, except that it is one 

 third smaller; the pores of the frond not visible; the fertile receptacle (the cap- 

 sule being fully mature) sessile, and entirely concealed by a dense mass of pur- 

 plish paleaj; antheridia not seen . — Texas, C. Wright. 



11. FIMEEIAKIA, Nees. Small Livekwokt. (Tab. 20.) 



Fertile receptacle hemispherical, concave beneath, expanded at the margin in- 

 to 4 large and pendent bell-shaped 1-fruited involucres. Perianth oblong-oval, 

 projecting half its length beyond the rim of the involucre ; the projecting por- 

 tion splitting lengthwise into 8-12 usually free, fringe-like segments. Calyp- 

 tra with a long style, fugacious. Capsule sessile, globose, dehiscing by an irreg- 

 ular circumcissile line near the middle. Spores muricate. Elaters rather short. 

 Inflorescence monoecious. Antheridia immersed in the substance of the frond, 

 not collected into disks. Frond much thickened in the middle, with a keel-like 

 midrib. (Name from fimbria, a fringe, alluding to the perianth.) 



1. W. fCfiella, Nees. Frond elongated- wedge-shaped, nearly simple, 

 notched at the end (6" -10" long, 2" -4" wide), green above, purple on the 

 margins and underneath. (F. mollis, Tayl.) — Alleghany Mountains, in shady 

 places. (Tab. 20.) 



2. F. elegTMIS, Spreng. Much smaller than No. 1 : remarkable for the 

 very prominent papillae of the fertile receptacle ; the lobes of the perianth co- 

 hering at the apex into a short tube. — Texas, C. Wright. (Eu.) 



12. PLAGIOCHASMA, Lehm. & Lindenb. (Tab. 20.) 



Fertile receptacle arising from the back of the frond, deeply 2-4-lobed; lobes 

 ascending. Involucres very large, subcompressed-ovoid, erect, 1-fruited, oppo- 

 site to and concealing the minute lobes, 2-valved, dehiscing by a vertical slit. 

 Perianth none. Calyptra fugacious. Capsule globose, subsessile, horizontal, 

 rupturing at the apex by an irregular line. Spores enveloped in a transparent 

 rugose membrane. Elaters of medium length. Antheridia immersed in sessile 

 disks at the end or in the middle of the frond. Frond rigid, thick. (Name 

 composed of irXdyios, placed sideways, and ^do^ia, a chasm, referring to the lat- 

 eral dehiscence of the involucre.) 



1. P. Wrigiltii, n. sp. Frond 5" -10" long, l£"- 2" broad, continuous 



at, the apex, glaucous above, with dark purple scales beneath, the margins cren- 



ulate, ascending, convolute ; involucres usually three ; peduncle scarcely one 



line high, paleaceous at the apex and base. — Under overhanging rocks, along 



is; Texas, C. Wright. (Tab. 20.) 



