—46- 
Leaves with paired teeth, at least at base; papillae over the 
lower portion of the lumen, or sometimes over the middle. 
Leaves in regular rows. 
Rows spiral; leaves obtuse, costa very stout, red- 
papillate P. seriata. 
Rows not spiral; stem-leaves acute, very concave; 
costa more or less excurrent P. americana. 
Leaves not in regular rows. 
Leaves wholly plane P. caespitosa. 
Leaves revolute. 
Plants of medium height. 
Stems slender; stem leaves erect, patent at tip, 
oblong lanceolate, revolute nearly to apex; 
costa slender, long piliform-excurrent 
P. tomentella. 
Stems stouter; stem leaves falcate- secund, 
narrowly lanceolate, revolute to middle, 
very long acuminate; costa slender, excur- 
rent P. fallax.. 
Plants large, stem leaves plicate at base, broadly 
oblong, acuminate; costa strong, more or less 
excurrent P. fontana. 
South American species. 
Stems easily separating, simple; leaves secund, oblong; costa 
mucronate-excurrent P. parallela. 
Stems coherent. 
Costa stout, percurrent P. pelluddiretis , 
Costa medium size, more or less excurrent. 
Leaves oblong lanceolate, concave, plicate, long 
acuminate P. fontanella. 
Leaves narrowly lanceolate, plane, not plicate; 
costa mucronate-excurrent P. elegantissima. 
Section IV. — PSEUDO-MNIOBRYUM. Broth., Natuer. Pflanzenf. 
1.3: 652. (1904) P. vagans. 
1. Philonotis RADICALIS (Beauv.) Brid., Bryol Univ. 2 : 17. 
(1827). 
Bartramia radicalis Beauv., Prodr. 44. (1805). 
Lesq. & James, Manual. 206. (1884). 
Sulliv., leones Muse. 85. t. 52. (1864). 
Ph. orizabana. Schimp. mss. Besch., Prodr. Bryol. Mex. 58. 
(1871). 
A species of the eastern coast of the United States and Mexico* ; 
ranging from New York to the Gulf, west to Kansas. 
*Rrothems, in Natuer. Pflanzenf. 1.3; 646, reports this species from Corea. 
