532 The Ohio Naturalist. [Vol. VI, No. 7, 



tangular acute sinus; underleaves often on sterile stems as 

 also on fruiting branches. divaricata Dumort. 



Growing on rotten wood; dioecious; perianth broadly oval to 

 ovatefusiform. 8. 

 8. Perianth small, whitish, obovate or ovate-fusiform, obtusely -i- 

 angled, the mouth setulose or ciliate; leaves with a broad or 

 lunate sinus and broad-subulate, mostly acute lobes. 



Maconnii Aust. 



Perianth broadly oval or subobovate, obtusely angled, the apex 



slightly plicate, the mouth connivent, dentate, sometimes 



narrowly scarious; leaves imbricate, more or less serrate, the 



sinus and lobes subacute; underleaves present. 



Sullivantii Aust. 

 Chiloscyph us Corda . 



1. Underleaves 4-parted; involucral leaves 2-cleft; perianth 2-3 



lobed, the lobes long and lacerate-toothed. 



adsccndcns Hook, and Wils. 

 Underleaves bifid. 2. 



2. Involucral leaves 2-toothed; perianth 3-lobed, the lobes spinose- 



dentate. pallcscens Dumort. 



Involucral leaves slightly 2-toothed; perianth 3-lobed, the short 

 lobes nearly entire. polyanthos Corda. 



Conocephalus Neck. 



Thallus dichotomous, reticulate and porose. Antheridia imbedded 

 in an oval disk, sessile near the apex of the thallus. Spores 

 large, muriculate, brown. Dioecious. coniciis Dumort. 



DiplopJiylhim Dumort. 



vStem acsending, nearly rootless; leaves closely folded and subden- 

 \ ticulate, with or visually without a pellucid line near the base, 



the lobes obtuse or acutish, the lower oblong-scymitar-shaped, 

 coarsely dentate, the upper smaller, subobovate. 



albicans Dvimort. var. taxifolium Nees. 

 ] )iimorlicria Nees. 



Thallus thin, soft, forking, usually ivith scattered hairlike rootlets 

 beneath, naked or with a delicate, appressed pubescence 

 above; peduncle chaffy at apex. Spores muriculate. Dioe- 

 cious, hirsuta Nees. 

 Fimbriaria Nees. 



Thallus simple or bifurcate, mostly conspicuously porose, with 

 scales below, their hairlike ends surpassing the leafborder in 

 shape of a long white beard. Antheridia immersed in the 

 thallus. Spores roundish-angular, subreticulate. 



tcnclla Nees. 

 Fossomhronia Raddi. 



1. Plant minute; stem forked or fastigiately divided; spores pale 



fuscous, more or less tuberculate. cristida Aust. 



Plant large or of medium size; stem mostly simple. 2. 



2. Sfjores brown, depressed-globose-tetrahedral, crested, the slender 



(16-24) crests pellucid, rarely confluent. pusilla Dumort. 



Spores reticulated and ])itted. 3. 



3. Spores yellowish brown, glol)ose-tetrahdral, not depressed, deeply 



reticulated, the 7-9 reticulations large and deep, 5-6 angled 

 and winged. angulosa Raddi. 



Spores yellowish to dark brown, globose-tetrahdral, less dee])ly 

 reticulated, and pitted, the 12-18 reticulations 4-6 angled 

 and indistincth- crenate. Dumortieri Lindb. 



/•'nilhiina Raddi. 



1. Perianth smooth; leaves marked by a central moniliform row of 

 cells or 1)y a few large scatti'red cells; lower lobe cylindric- 

 saccate. 2. 



