It has been found difficult, if not impossible, to draw a line be- 

 tween those of economic importance and the others, so that all forms 

 found are included. Such a procedure will be of value since some of 

 these fungi may at some time assume a parasitic role or they may 

 be those reported as causes of disease in other cane growing regions. 



All are grouped in this one division since it would be rather dif- 

 ficult to assign them to the other sections satisfactorily, gro\\dng as 

 they do to a large extent on cane trash or debris, including leaves, 

 stalks, roots and cuttings. Descriptions are given where the original 

 has been modified or changed and of such species as are recorded 

 as new. 



Arcyria cinerea (Bull) Schum. 



Porto Rioo. — On dead leaves, Rio Piedras, Jan., 1914, 1169, Nov., 

 1916, 5806. Also common on dead wood. Determination by Dr. W. 

 C. Sturgis. (PL XXV, fig 5.) 



A gray, stalked form with cylindrical to elliptical heads, resem- 

 bling the following species except in color. 



Arcyria denudata Fr. 



Porto Rico. — On dead leaves, Rio Piedras, Jan., 1914, 1170, 1915, 

 3379. A delicate, red, stalked form common on dead wood every- 

 where. Determination bj'- Mrs. F. W. Patterson. 



Craterium aureum (Shiim) Rost. 



Porto Rico. — On cane trash, Mereedita, Jan., 1912, 4167 ; Rio Pie- 

 dras, Oct., 1915, 3167, Nov., 1916, 5801. Original determination by 

 Dr. Sturgis. A small stalked form globular to ovoid. 



Craterium leucocephaltjm (Pers) Rost. 



Porto Rico. — On cane trash, Rio Piedras, July, 1916, 5642. Not 

 common. Determination by Dr. Sturgis. 



Dictydifm cancellatum (Batsch) Macbr. 



Porto Rico. — On cane trash, Oct. 1915, Rio Piedras, 3172. Rare. 

 Determination by Dr. Sturgis. 



FuLiGO septica (L) Gmel. 



Fiiligo ovata (ScJtaeff) Machr. 



Porto Rico. — On cane trash, Rio Piedras, April, 1912, 4314, July, 

 1912, 4492; Juana Diaz, March, 1915, 2645. (Comm. Wolcott). Com- 

 mon on plant debris of all kinds. Determination by Dr. Sturgis. 



211 



