leaves. More common on certain varieties. (PI. XXX, fig-. 1-5; pi. 

 XXV, fig. 4) 



Periconia sacchari Johnston sp. nov. 



Fertile liypliae erect, scattered but very numerous, not blackening 

 tlie substratum, dark 200-300 mu. high, with short branches at the 

 tip ; branches appressed, cylindrical, or more or less lageniform, some- 

 times constricted ; conidia ovoid or elliptical to finally cylindrical in 

 the mature form, rounded at both ends, brown, finally tuberculate, 

 11.2X22-24 mu. 



Porto Rico. — On dead and dying cane leaves, often associated 

 with wither-tip, Rio Picdras. April, 1917. 6384 (type). Very com- 

 mon. A common associate of Sphaerelhi saerhari. (Plate XXIX, 

 fig. 16-18.) 



Septonema sacchari Johnston & Stevenson sp. nov. 



Forming small black fruiting patches on tlio substratum, sterile 

 hyphae recumbent, often not apparent or anastomosing to form a 

 loose net-work; fertile hyphae short but little different from the 

 conidia; conidia catenulate, 1-3 septate, more often 2-septate, basal 

 cell truncate, brown, lighter where the chains branch, minutely spiny, 

 one end cell larger, rounded, and 7.25X13-25 nm. 



Porto Rioo. — On cane leaves. Rio Piedras, Feb., 1914, 1650, May, 

 1917, 6404 (type). Macroscopically resembles Spegazzima ornata. 



Tetracoccosporis sacchari Stevenson sp. nov. 



Foiming small, sooty, black, subcircular to ivn^gular masses on the 

 substratum, 1-2 mm. average diam.. occasionally coalescing to form 

 masses up to 1 cm. diam. ; sterile hyphae recumbent, generally not 

 apparent; fertile hyphae erect, hyaline to smoky, strongly septate; 

 septae appearing as broad black bands at short intervals ; spores pleu- 

 rogenous, sessile, completely covering conidiophore. arranged in regu- 

 lar series, more or less flattened-hemispherical, distinctly rugulose, 

 cruciate-divided into 4 cells, averaging 10 mu. diam. 



Porto Rioo. — On dead cane leaves, Rio Piedras, Feb., 1914, 1421, 

 Nov. 1916, 6049 (type). Macroscopically not distinguishable from 

 Spegazzinia ornata. (PI. XXVII, fig. 19, 20.) 



Tetraploa aristata (B&Br). 



Plants scattered, few in number, generally among other fungi, 

 olivaceous to black; conidia oblong, biseptate-muriform, brown to 

 sooty, guttulate, 20-30 mu., apex formed by four liorns, 60-90X4 

 mu., pluriseptate, lighter in color than body of spore. Description 

 modified after Saccardo. 



225 



