BARNES NORTH AMERICAN MOBBES. 



177 



PHASCUM, p. 41. 



Capsule sub-globose, apiculate. 

 Leaf margins plane or incurved, denticulate 

 Leaf margins reflexed, quite entire. 



Capsule immersed 



Capsule sub-exserted .... 

 Capsule ovate- or oblong-lanceolate 



P. Carniolicum, 42. 



P. cuspidatum, 42. 



P. subexsertum, S5. 



P. bryoides, 42. 



P. subulatum, 43. 

 P. Rayenelii, 43. 



PLEURIDIUM, p. 43. 



Inflorescence paroicous. 

 Costa reaching the obscurely serrate apex 

 Costa excurrent into a smooth awl-shaped point 

 Inflorescence autocious. 

 Upper leaves long subulate. 



Entire or apex denticulate or serrulate . P. alterni folium, 44. * 



Serrulate from middle upward .... P. Bolanderi, 44. 



Upper leaves abruptly short pointed ... P. Sulli yantii, 44. 



BRUCHIA, p. 45.* 

 I. Collum none B. palnstris, 45. 



II. Collum present. 



A. Exceeding the sporangium B. longicollis, 38. 



B. Shorter than or equaling sporangium. 



i. Capsule exserted. 

 Leaves short, not subulate. 



Spores papillose 



Spores pitted. 



Costa percurrent .... 

 Costa vanishing below apex 

 Leaves subulate. 

 Smooth or sub-papillose. 

 Costa filling point . 

 Costa not filling point, apex serrulate. 

 Spores spinose. 

 Capsule ovoid, neck short 

 Capsule elongated, neck long 



. B. Hallii, 47. 



B. breyifolia, 48. 

 . B. fusca, 39. 



B. curyiseta, 47. 



B. flexuosa, 1 46. 

 B. Sulliyantii, 46. 



1 See also Appendix, no. 36. 



2 See revision by Eliz. G. Britton, Bull. Torr. Bot, Club 21: 24a 1894. 



