Hepaticce of North America. 55 



3. A. sessilis Spreng. Thallus decumbent, irregularly 

 lobed, 2.5 5 cm. long, 0.6 1 cm. wide; involucre wanting; 

 pedicel 2 2.5 cm. long, sometimes folded upon itself and re- 

 maining within the calyptra, thus making the capsule appear 

 sessile; sterile receptacles elongate. 



Hob. Wooded swamps. Eastern U. S. 



Bib. Syn. Hep. p. 495, 788 ; Mem. Amer. Acad. n. ser. Ill, p. 62. 

 Delin. Mem. Amer. Acad. n, ser. Ill, t. V ; Sulliv. Mosses, U. S. 

 t. VII. 



Exsic. Hep. Bor.-Amer. No. 113. 



*** Calyptra smoothish. 



4. A. pinguis Dumort. Thallus decumbent or ascend- 

 ing, subsimple, somewhat linear; involucre short, lacerate; 

 calyptra cylindric ; sterile receptacles 2-lobed, the lobes obtuse. 

 (Jungermania pinguis L.) 



Hob Wet banks, So. States, O., Penn., N. J. (Eu.) 

 Bib Syn. Hep. p. 493-4; Hep. Europ. p. 143. 

 Delin Brit. Jung. t. 46 ; Ekart t.. VII, f. 51. 

 Exsic Hep. Bor.-Amer. No. 112, 112 b. 



5. A. pinnatifida Nees. Thallus pinnately divided or 

 subsimple, flat or subcanaliculate; branches horizontal, the 

 broader pinnatifid or dentate, obtuse. 



Hob. On dripping rocks, Hokokus, N. J. (Austin), near New Haven, 

 Conn. (Eaton). (Eu.) 



Bib. Syn. Hep. p. 495, 788 ; Hep. Europ. p. 142. 

 Delin Ekart t. XIII f. 109. 

 Exsic. Hep. Bor.-Amer. No. 115. 



II. PELLIA RADDI. 



Monoecious. Involucre arising from the upper side of the 

 thallus near the apex, cup-shaped, short, the margin lacerate- 

 dentate. Inner involucre wanting. Calyptra oval, membra- 

 nous, longer or shorter than the involucre. Capsule globose. 

 Elaters long, free, bispiral. Antheridia globose, immersed in 

 the broad indeterminate costa of the thallus. Named for Sig. 

 A. L. Petti, an Italian botanist. 



