228 BULLETIN OP THE UNIVERSITY OF WISCONSIN. 



PTERIGYNANDRUM, p. 288. 



Branch leaves acute, serrate or denticulate at the apex 



only P. flliforme, 1 280. 



Branch leaves acute or acuminate, denticulate nearly all 



around P. papillosnlum, 405. 



PTEROGONIUM, p. 289. 



Leaves broadly oblong-ovate or obovate, acute, smooth P. gracile, 290. 

 Leaves broadly deltoid-ovate, narrowly acuminate, papil- 

 lose P. brachypterum, 290. 



ANTITRICHIA, 8 p. 290. 



Capsule oval (1 : 2-2.5), leaf cells fusiform . A. curtipendula, 291. 

 Capsule cylindric (1 : 6), leaf cells oval . . A. Californica, 8 291. 



HOOKERIA, p. 292. 



Leaves bicostate to middle (not papillose?) . . H. varians, 292. 



Leaves bicostate to apex, papillose . . . . H. cruceana, 292. 



Leaves ecostate, entire (not papillose?) . . . H. Sullivantii, 4 293. 



FABRONIA, p. 294. 



Leaves ciliate-dentate. 



Peristome of 16 teeth, costa none or very short . F. pusilla, 294. 



Peristome none, leaves costate to middle . F. gymnostoma, 294. 



Peristome of 8 gemmate teeth, leaves costate nearly 



to middle F. octoblepharis, 295. 



Leaves serrate to subentire. 



Sharply serrate, teeth orange, spores about ll/* . F. Wrightii, 295. 



Obscurely serrate, teeth brown, spores about YJjLt F. Rayenelii, 295. 



Obscurely serrate, teeth with prominent articulations 

 on back . F. Donnellii, 295. 



1 See Appendix, no. 404. 



2 A sterile species, A. tenella, Appendix, no. 406a, is probably referrable to one of the 

 two species here given. 



8 See Appendix, no. 406. 



4 "Die Hookeria Sullivantii mihi unterscheide ich auch heute noch von H. lucens und 

 ebenso von H. acutifolia aus Indien." C. Miiller, in litt. ad E. G. Britton, 18 Jul. 1888. 



