iu a dense spiral about the sporophore, concave-convex when young, 

 becoming doubly-convex, dark brown, 7.25 mu. diam. X 4.4 mu. thick. 



Porto Rico. — On dead cane leaves, Rio Piedras. Feb., 1914. 1269 

 (type). (PL XXIX, fig. 1-3.) 



Basisporum gai.larum Moll. 



Porto Rico. — On dead cane stalks and leaves, Rio Piedras, Aug., 

 1912, 4545 ; Juncos, Aug., 1915, 2930. Determination by Miss Charles. 



Observed on material from all parts of the Island. This is one 

 of the very common saprophytic forms encountered in the work with 

 cane fungi, it being found on all parts of dead and dying cane plants, 

 often forming black irregular patches especially on leaves and dead 

 seed pieces. It has turned up in cultures several times, in one instance 

 of a top-rot case, and of various leaf -spots, but inoculations with it 

 have not been successful. It also occurs on other grasses {Panicum 

 barbinode, Eriochloa siibcilabra). 



It is characterized by comparatively large black circular or disk- 

 shaped spores, borne on jar-like basidia. The hyphae are hyaline to 

 broAvn and scanty, and all that is commonly seen are great masses 

 of the conidia. 



Cladosporium herb arum (Pers) Link. 



Porto Rioo. — On cane trash, Rio Piedras, Jan.. 19] 7, 8094, April, 

 1917, 6383. Very common on cane tops and trash lying in the fields 

 after the cane is cut. Appearing as numerous, bright green, slightly 

 raised masses uniformly distrilmted on the wilted leaves and discarded 

 stalks over all fields, becoming dark green or black. Also common on 

 other host material in mnny other situations. 



Hormiactella sacchari Johnston sp. nov. 



Sori small, black, scattered, about 1 mm. diam., consisting of sterile 

 erect hyphae mixed with the fertile; sterile hyphae black, septate, 

 more or less straight, 500-900 mu. long ; fertile hyphae shorter, 200- 

 300 mu. liigh, branching sparsely, bearing at intervals short lageni- 

 form branches or conidiophores ; conidia in short irregular chains, 

 spherical, rugulose, 6 mu. diameter. 



Porto Rioo. — On dead cane leaves, Rio Piedras, Feb., 1911, 4017, 

 Dec, 1911, 4141, April 1912, 4313, ]\Iay 1-12. 4353, 4357, August, 1912, 

 4538, 4567, Oct., 1912, 4638; Mercedita, Jan., 1912, 4153; Yauco, 

 March, 1912, 4315; Canovanas, July, 1915, 4525, Oct., 1912, 4642; 

 Mameyes, Dec, 1912, 4731; Anasco, May 1916, 5350. Very common 

 everywhere. Often associated with the M-ither-tip disease of the 



224 



