Hepaticce of North America. 43 



1. A. Wrightii (Sulliv). Thallus 12 cm. long, 84 

 mm. wide, continuous from the apex, glaucous above with dark 

 purple scales, the margins crenulate, ascending, convolute; in- 

 volucres usually 3: peduncle scarcely 2 mm. high, paleaceous at 

 the base and apex. (Plai/iocht#ma Wrightii Sulliv.) 



Hob. Under overhanging rocks along streams. Tex. ( Wright}. 

 Delin Sulliv. Mosses U. S. t. VI. 



2. A. erythrosperma (Sulliv.) Thallus expanded, obo- 

 vate, 0.6 1 cm. wide, pale green, rugulose, fuscous margined, 

 radiculose and squamous beneath; scales whitish, setaceous- 

 incised, extending beyond the margin toward the apex: pedun- 

 cle 1 1.7 cm. high, naked at the base, paleaceous at the apex; 

 spores orange-red, tuberculate: elaters quadrispiral. (Playio- 

 chasma erythrosperma Sulliv.) 



Hob Rocky Mts. (E. Hall). 



XII. LUNULARIA MICH. 



Carpocephalum cruciately divided into 1-6 (usually 4) hori- 

 zontal segments or involucres, which are tubular, vertically 

 bilabiate and 1-fruited. Inner involucre wanting. Calyptra 

 included, persistent, rupturing at the apex. Capsule exserted 

 on a long pedicel, 4-8-valved, the valves spreading, subtortuous. 

 Spores minute, nearly smooth. Elaters short, very slender, 

 bispiral, deciduous or a few remaining attached to the apex of 

 the valves. Peduncle very hairy, 2.5 3.8 cm. high, involu- 

 crate with numerous membranous scales at the base. Andrce- 

 cium oblong, sessile in the sinus at the apex of the thallus. 

 Thallus oblong, with rounded lobes, distinctly areolate and 

 porose, squamigerous. Scales imbricate, sublunulate, their 

 apex abruptly contracted into a roundish cochleariform lobe. 

 Gemmae in crescent-shaped disks on the back of the thallus. 

 Name from Lat. lunula, a little moon, alluding to the gemmae- 

 bearing receptacles. 



1. L. cruciata Dumort. Thallus 2.5 5 cm. long, fur- 

 cately divided, innovating from the apex, with a somewhat dif- 

 fused costa. (L. vulgaris Mich., Marchantia cruciata L.) 



The only species; introduced into greenhouses; always sterile. 

 (Eu.) 



Bib. Syn. Hep. p. 511 ; Hep. Europ. p. 147. 

 Exsic Hep. Bor.-Amer. No. 126. 



