74 Illinois State Laboratory of Natural History. 



2. P. xanthocarpa Lehm. and Lindenb. Stems (58 

 mm. long, creeping, subpinnately branching; leaves imbricate, 

 ovate-subcultrate, obtuse, entire, the ventral margin straightish, 

 the lobule convolute, ovate, the apex emarginate-truncate ; am- 

 phigastria contiguous, reniform-subrotund. entire; inner invo- 

 lucre lateral, subsessile, obovate, emarginate, ventrally carinate. 

 the carina 2-winged at the apex. (Lejeunia catenulata Nees, 

 Jungermania transver sails Schwein. ) 



Hob. On trees in the So. States (Suttimnt, Ravenel). 

 Bib.-Syn. Hep. p. 323 (sub Lejeunia). 

 Exsic. Hep. Bor.-Amer. No. 95b. 



X. MADOTHECA DUMORT. 



Dio3cious. Sporogonium lateral, nearly sessile. Inner in- 

 volucre ovate, biconvex, the mouth bilabiate, incised or entire. 

 Involucral leaves 2 or 4, 2-lobed. Calyptra globose, persistent, 

 rupturing below the apex. Capsule globose, on a peduncle lit- 

 tle exceeding the inner involucre, membranous, pale. Elaters 

 free, attenuate at both ends, bispiral. Spores rather large, 

 somewhat angular. Antheridia in the saccate bases of closely 

 imbricate, 2-lobed perigonial leaves. Leaves deeply and un- 

 equally bilobed. Amphigastria large, decurrent. Name from 

 Gr. mados, bald, and theka, capsule. 



* Amphigastria entire or nearly so. 

 f Stems commonly simply pinnate. 



1. M. rivularis Nees. Stems somewhat pinnate or tri- 

 fid ; leaves entire, closely imbricate, the lobes ovate ; upper lobe 

 convex, obtuse, decurved; lower lobe much smaller, separated 

 nearly to the base, revolute from the middle backward; amphi- 

 gastria somewhat scattered, subquadrate, rounded and reflexed 

 at the apex; involucral leaves entire, the lobes acute, the upper 

 ovate, the lower smaller, ovate-obi oiig; inner involucre bilabiate. 



Hob. On shaded rocks, near Yellow Springs, 0. (Sullivant), Cal. 

 (Bolander), N. Mex. (Fendler). (Eu.) 



Sib.Syn. Hep. p. 278, Hep. Europ. p. 24. 

 Exsic. Hep. Bor.-Amer. No. 91b, 91 c. 



