HYPNACEAE 97 



species of Campylium most likely to be confused with them 

 will not do so. 



Plagiothecium striatellum may be sought here, as it has the 

 appearance of a Campylium, but the stem is without central 

 strand, the leaves are serrate and the capsules strongly striate 

 when dry. 



C. chrysophyllum (Brid.) Bryhn. "Very common," Muse. 

 App. 394. Most of our material is forma intermedia Grout. 

 Muse. App. 396 (as var. rnpestre) is very close to the typical 

 form. Early summer, common on moist shaded soil. 



C. hispidulum (Brid.) Mitt. Near or on the ground in moist 

 shaded places. "Common," Muse. App. 392; Garretsons, 

 Princes Bay, Richmond, S. Id., E. G. B.; Yonkers, Howe; 

 Closter, N. J., Austin; Centreport, L. Id., Sanial. Forma 

 compacta Grout, Hempstead, L. Id. (type locality). Summer. 



C. polygamum (B. & S.) Bryhn. "Swamps about Closter, 



N. J., rare," Muse. App. 401. 



C. radicale (P. B.) Grout. Frequent on soil in swampy 

 woods. "Very common," Muse. App. 391 (as Hypnum bergen- 

 ense Aust.). 



C. stellatum (Schreb.) Bryhn. "Wet meadows near Closter, 

 N. J.," Muse. App. 399. Fredon, N. J. Wiegmann, June. 



Var. protensum (Brid.) Roehl. Closter, Austin, Bx! 



DREPANOCLADUS C. M. (Plate XI.) 



Of all the mosses this genus is probably the most difficult be- 

 cause of the extreme variability of the plants. Even the recog- 

 nized authorities in the group identify many specimens by 

 telling what they are nearest rather than by referring them 

 definitely to a described form. Nearly all grow in water or very 

 wet places and the amount of water and other conditions of their 

 immediate environment appear to modify their growth pro- 

 foundly. Sometimes two well marked varieties can be found 

 on the same plant. So variable are the leaves that it is abso- 

 lutely necessary to take fully developed leaves from the older 

 portions of the stem for purposes of study and comparison. In 



