hopogon citratus, Iiio Piedras, Oct., 1911:, i;281. On Bamhusa vul- 

 garis, Trujillo Alto, Nov., 1914, 2396. Very common in all sections. 

 First determination by Mm. F. W. Patterson. (PI. XXIV, fig. 2; 

 pi. XXVIII, fig. 5.) 



This fungus is extremely common on many varieties of cane, occur- 

 ring on the back of tlie leaf-blades and sheaths and particularly on 

 the back of the mid-rib It also occurs on the flower stalk. It does 

 very little harm beyond hastening the death of leaves already weak- 

 ened by other causes. The fimgus is conspicuous because of tlie 

 long lines of black immersed sporodochiu opening by long slits, the 

 black spore masses often being visible with a hand lens. Macrosco- 

 pieally it can not bo distinguished from Marsonia sp. 



Arthrobotrys superb a Cda. 



Porto Rioo. — On dead and dying cane, Eio Piedras, July, 1912, 

 4493. July 1917, 6607. First determination by Mrs. F. W. Patter- 

 sou. (PI. XXX, fig. 7-9.) 



Aspergillus flavus Link. 



Porto Rioo. — A very common saprophytic form on dead cane, 

 particularly on seed pieces in the ground, and on material after it is 

 brought to the laboratory. A form morphologically not distinct at- 

 tacks the mealy bug (Pseudococcus sacchari) of cane, often over wide 

 areas. Also isolated from soil, moldy tobacco, and other sources. 



AsPEKGii;Lus NIGER Van Tieghem. 



Porto Rico. — A common saprophytic form, particularly noted on 

 imperfectly sterilized material in damp chambers. It produces a 

 reddening of cane tissue. 



MONILLA SITOPHILA (Mout) SaCC. 



Effuse, beautiful deep rose in color, primary hyphae as(;ending 

 from the procumbent mycelium, 120-130X12 mu., scantily septate- 

 constricted, above divided into dichotomous branches; branches and 

 branchlets somewhat broad, crowded, septate and easily separating; 

 conidia acrogenous, shortly catenulate, globose, 10-12 mu., bases dis- 

 tinctly apiculate where joined by isthmi. Description after Saccardo. 



Porto Rioo.— On burnt cane, Rio Piedras, March, 1911, 4042. 4057. 

 Also observed at base of Gynerium. sagitatum and Sahal causiarum 

 where injured by fire. (PI. XX, fig. 2.) 



This very interesting fungus occurs on all debris remaining after 



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