38 TlUnois Sfritc Lahoratori/ of Nat inn J Histori/. 



Capsule ()l)long-<>-l()l)().se, deliiscing by 4-6 irregular valves, dis- 

 tinctly pedieelled. Spores minute^ muriculate. Elaters parie- 

 tal,* very long, straight, attenuate at both ends, bi-trispiral. 

 Androeeium short peduncled, paleaceous underneath the mar- 

 gin (in the young state ciliate). Thallus large, thin, soft, with 

 a slight costa, dichotomous, continuous or articulate at the 

 apex, with or without pores, usually with hair-like rootlets 

 scattered over the entire under surface. Gemmae wanting. 

 Named for B. C. JhiDiorfler, a Beigian botanist, born 1797. 



1. D. hirsuta Nees. Dioecious; thallus 5 — 15 cm. long, 

 1.3 — 2 cm. wide, thin, deep-green, becoming blackish, plane and 

 entire on the margins, exareolate and naked, or sometimes with 

 a delicate, coarsely reticulated, closely appressed, cobweb-like 

 pubescence above, hirsute and esquamulose beneath; carpc- 

 cephalum many-fruited, convex, its margins like those of the 

 involucres, closely setulose, the upper surface sparingly so; pe- 

 duncle rather long, chaffy at the apex, slightly involucrate at 

 the base, otherwise naked; capsule wall composed of very long 

 thick cells containing broad rings or bands; androeeium on a 

 short peduncle, setulose over the entire upper surface; fruit 

 rare. ( Marchantia hirsuta Swz. ) 



Hah. — Faces of moist calcareous rocks, S. C. {Ravenel), Easton, Pa. 

 (Porter), La. {Featherman). 



Bib.— Syn. Hep. p. 543, 790. 

 Delin.—Sumv. Mosses U. S. t. VI. 

 Exsic. — Hep. Bor.-Amer. No. 1.30. 



IX. CONOOEPHALUS Neck. 



Carpocephalum conic-mi triform, membranous. Involucres 

 5-8, tubular, 1-fruited, suspended from the apex of the pedun- 

 cle, coherent with the interior surface of the carpocephalum. 

 Inner involucre wanting. Calyptra persistent, carapanulate, 

 2-4-lobed at the apex. Capsule oblong-pyriform, dehiscing by 

 5-8 revolute segments, pedieelled. Spores muriculate. Elaters 

 short, thick, bispiral. Androeeium disciform or oval, sessile 

 near the apex of the thallus. Thallus dichotomous, copiously 

 * Adhering to the inner face of the capsule wall. 



