- 8 7 - 
19. Brachythecium acutuM (Mitt.) Sulliv. Rock Creek. 
20. “ oyxcladon (Brid.) Jaeg. & Sauerb. ( Brachythecium 
laetum Brid.) Arlington; Rock Creek; Soldiers’ Home grounds. 
21. Brachythecium plumosum (Sw.) B. & S. Rock Creek; banks of the 
Potomac. 
22. Brachythecium rutabulum (L.) B. & S. Glen Echo; Cabin John’s. 
23. Bruchia flexuosa (Schwaegr.) C. M. Spencerville, Maryland. 
24. Bryhnia Novae-Angliae (Sulliv. & Lesq.) Grout in Bull. Torr. Bot. 
Club, May, 1898 p. 229. ( Brachythecium Novae-Angliae ; Eurh- 
ynchium Novae-Angliae). The tenability of this genus has been 
questioned. Rock Creek; District of Columbia (collected Coville). 
25. Bryum argenteum L. Arlington. 
26. “ caespiticium L. Agricultural Department grounds. 
27. cirratum Hoppe & Hornsch. Bladensburg Road. 
28. Catharinea angustata Brid. (. A trie hum angustatum (Brid.) B. & S.) 
Rock Creek. 
29. Catharinea undulata W. & M. (. Atrichum undulatum (L.) P. B.). 
Rock Creek. 
30. Ceratodon minor Aust. (Det. Mrs. E. G. Britton). Rock Creek. 
31. Ceratodon purpureus (L.) Brid. Rock Creek: Bladensburg Road. 
32. Cirriphyllum Boscn (Schwaegr.) Grout in Bull. Torr. Bot. Club, 1898, 
p. 226. 
(. Eurhynchium Boscii (Schwaegr.) Jaeg.). Rock Creek. 
33. Climacium Americanum Brid. Rock Greek. 
34. Climacium Americanum Kindbergii R. & C. in Bot. Gaz., 1890, p. 59. 
See also The Bryologist, 1901, p. 54, and 1906, p. 8. Rock Creek. 
35. Cryphaea glomerata B. & S. Pock Creek. 
36. Dicranella heteromalla JL.) Sch. Ingleside; Catholic University 
grounds; Rock Creek. 
37. Dicranella heteromalla orthocarpa (Hedw.) L. & J. (= Dicranella 
Fitzgeraldii R. & C., fide Cardot in Bull. Herb. Boiss. Vol. 7, No. 
4, and Dicranella Fitzgeraldi R. & C. in Bot. Gaz. 1888, p. 197). 
Rock Creek. 
38. Dicranella rufescens (Turn.) Sch. Mixed with Ditrichum tortile. 
Rock Creek. 
39. Dicranella varia (Hedw.) Sch. Glen Echo. 
40. Dicranum flagellare Hedw. Rock Creek. 
41. Dicranum fulvum Hook. Rock Creek. 
42. Dicranum sabuletorum R. & C. in Bot. Gaz. 1889, p. 91, T. 12 A. Rock 
Creek. 
43. Dicranum scoparium (L.) Hedw. Spencerville, Maryland. 
44. Dicranum scoparium pallidum (Mull). L. & J. Rock Creek. 
45. Ditrichum pallidum (Schrad.) Hpe. Rock Creek. 
46. Ditrichum tortile (Schreb ) Brockm. Rock Creek. 
47. Ditrichum tortile pusillum (Timm) Brock. Rock Creek. 
48. Ditrichum tortile var. A peculiar variety with leaf margins of two cell 
