34 Illinois State Laboratory of Natural History. 



1. P. hemisphserica Cogn. Monoecious or sometimes 

 dioecious; thallus 2.5 5 cm. long, 0.6 1.3 cm. wide, with con- 

 spicuous white pores above and dark purple, imbricated scales 

 beneath; carpocephalum somewhat angled by the prominent 

 keel-like rays; peduncle 1 2.5 cm. high, slightly hairy or 

 squamulose; capsules conspicuous, dark purple; andrcecium pe- 

 duncled, peltate, repand-lobed at the margin, the peduncle 

 1 2.5 cm. high. (Marchantia hemisphcerica L., M. commu- 

 tata Lindenb., Preissia commutata Nees.) 



Hob. On slate and limestone rocks in moist ravines, N. J. westward 

 to Col. and northward to Hudson's Bay. (Eu.) 

 Bib. Syn. Hep. p. 539; Hep. Europ. p. 152. 

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

 Exsic. Hep. Bor.-Amer. No. 129. 



III. SAUTERIA NEES. 



Carpocephalum peduncled, 2-4 parted, the fruit-bearing 

 lobes separate to the base, the intermediate rays obsolete or 

 tooth-like. Peduncle pale, naked at the base, continuous with 

 the thallus. Outer involucres as many as the lobes forming a 

 declined tube, more or less separate, dehiscing with a wide slit 

 and disclosing a 2-5 parted pileus, 1-fruited. Inner involucre 

 wanting. Calyptra persistent, pyriform-campanulate, bursting 

 irregularly, equalling or slightly exceeding the involucre. Cap- 

 sule globose, 4-6-valved, pedicelled. Elaters formed at the base 

 of the capsule, bi-quadrispiral, deciduous. Thallus subsimple 

 or continuous at the apex, without median costa, papillose and 

 porose above, squamous below. Gemmae wanting. 



1. S. limbata Aust. Thallus obovate-oblong, sub-di- 

 chotomous, concave, reticulate-papillose and light-green above, 

 much thickened, dark-purple and squamous beneath, with a 

 broad, membranous, dark-purple, subplicate, undulate-crenate, 

 incurved margin; scales closely imbricate, purple, the lower 

 ones large, oblique, 2-horned, nodose-dentate and placed near 

 the margin of the thallus; the upper still larger, lanceolate and 

 extending beyond the apex of the thallus as an inflexed fringe, 

 at length whitish: carpocephalum 1-3-fruited, shortly but 



