54 Illinois State Laboratory of Natural History. 



I. ANEURA DUMORT. 



Dioecious. Sporogonium arising from the under side of 

 the thallus near the margin. Outer involucre cup-shaped, very 

 short and lacerate or wanting. Inner involucre wanting. 

 Calyptra ascending, nearly cylindric, fleshy. Capsule oval or 

 oblong, 4-valved. Elaters unispiral ; adherent to the apex of 

 the valves. Antheridia immersed in the upper surface of re- 

 ceptacles proceeding from the margin of the thallus. Thallus 

 fleshy, destitute of a midrib. (RiccARDiA B. Gr., Lindberg.) 



* Calyptra tuberculate. 



1. A. multifida Dumort. Thallus brownish-green, 

 prostrate, pinnately divided, the primary portion biconvex, 

 somewhat rigid; branches horizontal, the secondary pectinately 

 pinnate with narrow linear divisions; fructification from the 

 primary portion or from lateral branches; involucre top-shaped, 

 fleshy. (Jungermania multifida L.) 



Var. major Nees. Primary portion and branches thick, 

 the branches interruptedly bipinnate; all the divisions short, 

 obtuse. (Jungermania Upinnata Schwein.) 



Hob On decaying wood and moss in swamps. N. J. (Austin], 

 Alleghany Mts. (Eu.) The var. growing over mosses on rocks. 



Bib. Syn. Hep. p. 496, 788; Hep. Europ. p. 141; Schweinitz Spec. 

 Flo. Amer. Sept. p. 20. 



Delin. Brit. Jung. t. 45 ff 3 et 6 ; Ekart t. VII f. 50. 



Exsic. Hep. Bor.-Amer. No 116, 116 b. 



2. A. palmata Nees. Thallus palmately divided, the 

 primary portion depressed-plane, procumbent; branches ascend- 

 ing, 4 6 mm. high, pinnatifid-palmate, the divisions linear, 

 obtuse or truncate; fructification lateral; involucre lacerate. 

 (Jungermania palmata Hedw.) 



Hob. Rotten logs, etc. Eastern U. S. (Eu.) 

 Bib. Syn. Hep. p. 498, 788 ; Hep. Europ. p. 143. 

 Delin. Ekart t. XIII f. 115. 

 Exsic. Hep. Bor.-Amer. No. 114. 



** Calyptra merely papillose at apex. 



