150 American Midland Naturalist Monograph No. 6 



la. Bartramia pomiformis var. crispa (Swartz) Bryologia Europaea 

 This variety is taller and looser than the species: leaves longer, more dis- 

 tant, when dry more crispate; the innovations are long, often longer than 

 the seta. 



In moister or more shaded situations but with much the same general 

 distribution as the species. 



McKean Co.: D.A.B. (Porter's Catalogue). 



2. Bartramia ithyphylla [Haller] Hedwig 



Densely cespitose, silky, glaucous-green or yellowish: leaves closely, rigidly 

 divergent from, a white, scarious, erect-appressed glossy base, when dry quite 

 straight and more or less erect, the spreading lamina linear-subulate, abruptly 

 contracted from the obovate base, margin plane, sharply denticulate above; 

 costa strong but not very distinct above, excurrent into the denticulate 

 subulation; basal leaf-cells linear, 4-10:1, hyaline, the median and upper 

 papillose, obscure, about 3-6:1: seta long; capsule similar to that of B. 

 pomiformis, globose-oblong, when dry curved and deeply furrowed; peristome- 

 teeth reddish-brown, apically bifid or irregularly perforate; segments yellowish, 

 cleft, much shorter than the teeth: synoicous: spores large, mature in summer. 



On moist earth or in moist fissures of rocks, mainly in alpine regions, in 

 Europe, Asia, and in Arctic and temperate North America. 



Rare in our region. Fayette Co.: Layion's, Rev. S. W. Knipe. (Porter's Cata- 

 logue), and Knight. (Lesquereux and James). 



3. Philonotis Bridel 



Dioiccus, rarely autoicous: very slender to robust, cespitose, bright green 

 to yellowish-green or bluish-green: stem with a distinct central strand, erect, 

 more or less elongate, usually with whorled sub-floral shoots; leaves erect- 

 spreading to secund, uniform, or dimorphic, lance-ovate, mostly acute, dentate 

 or serrate, mostly with lamina one-layered; costa percurrent to excurrent, rarely 

 incomplete, cells of the apex elongate to shortly rectangular, sometimes rhom- 

 boidal, rarely parenchymatous and 5-6-sided, mostly ventrally or on both sides 

 mamillate, rarely so only dorsally, or rarely smooth, basal cells more lax: 

 sporogonia solitary, seta erect, long; capsule inclined to horizontal, globose, 

 unsymmetric, with mostly short coUum, striate, when dry sulcate and mostly 

 constricted in the middle, rarely drying erect and smooth; peristome mostly 

 double, the inner one rarely lacking; teeth 16, generally with interlamellar 

 thickenings; basal membrane high; cilia distinct, except in P. Muhlenbergii; 

 lid mostly low-convex to short conic. 



A. large and cosmopolitan genus of about 175 species, on earth and rock 

 in swamps and springy places and on dripping ledges; probably about 30 

 species in North America; five species in our general region. 



Key to the Species 



A. Perigonial bracts mostly obtuse, widely spreading from an erect base; median leaf- 

 cells abojt .006-.010 mm wide; leaves dimorphic: cilia well-developed ....4. P. fontana 



A. Perigonial bracts acute ot acuminate B 



B. Perigonia gemmiform, often apparently lateral; autoicous; costa percurrent to 



