BARNES NOETH AMERICAN MOSSES. 197 



SCOULERIA, p. is?- 1 



Leaves bordered by slightly larger, thick walled cells, pe- 



ristome present S. aquatica, 2 137. 



Leaves bordered by larger denser cells, peristome absent S. marginata, 164. 



GRIMMIA, p. 134. 



Capsule longer than the seta. 



Straight, capsule symmetric 1. Schistidium. 



Crooked, capsule ventricose .... 11. Gasterogrimmia. 

 Capsule shorter than the seta. 



Seta arcuate 111. Eugrimmia. 



Seta straight IV. Guembelia. 



1. Schistidium. 



Leaves with hyaline points. 



Capsule oblong . . . . . G. ambigua, 135. 



Capsule ovate-globose. 

 Leaves erect or appressed when dry. 



In small, dense cushions, soft lurid green . G. conferta, 8 135. 

 In lax cushions, coarse, fuscescent. 



Peristome distinct, orifice dilated . . G. sphaerica, 191+ 

 Peristome rudimentary, orifice not dilated G. apocarpa, 136. 



Leaves spreading when dry ... G. heterophylla, 168. 



Leaves muticous. 

 Margin plane. 

 Entire or slightly serrate at the apex. 



Ovate-oblong, short G. atricha, 169. 



Linear lanceolate G. maritima, 137. 



Coarsely dentate at the apex .... G. Agassizii, 136. 



Margins recurved or revolute . . . | G apocTrpa I vars ' 4 



1 Grimmia Scouleria, L. & J. Man. 137. This genus has lately been revised by Mrs. 

 Elizabeth G. Britton, Bull. Torr. Bot. Club 22: 36. 1895. S. Muelleri Kindb. and 

 S. aquatica catilliformis Mull, are reduced to 8. aquatica Hook. 8. Nevii is referred 

 to S. aquatica nigrescens Kindb. 



a Grimmia Scouleri Mull. See Appendix, no. 163. 



* G. chloroblasta Kindb. (Appendix, no. 167) falls here. See also no. 166. 



4 See Appendix, nos. 165, 166. G. platyphylla Mitt. (L. & J. Man. 136) = G. apocarpa 

 latifolia Zett. sec. Ren. & Card. Rev. Bryol. 19: 85. 1892. A barren species, G. pachy- 

 neurula C. M. & Kindb., Mac. Cat. 65 (see Appendix, no. 170), evidently belongs to this, 

 section. 



