PAPERS ON BOTANY 211 
On Passifora sexflora, Mayaguez, 1140. 
Cercospora trichostigmae sp. nov. 
Spots definite tan colored, angular, 3-10 mm. in diameter, 
Conidiophores hypophyllous, arising from small black tuber- 
cular masses, short, dark Conidia oblong, cylindrical, obtuse at 
each end, pale straw colored, 34x50x3 », many septate. 
On Tnichostigma octandra, Barceloneta, 9254 (type), Rio 
Piedras, 9470. 
The conidiophores are so closely compacted as to make this 
a transition form between the Moniliales and Tuberculariales. 
Cercosporia cucurbiticola P. Henn. 
On Cayaponia Maricao, 4815. Rosario, 3777. The species 
of the two hosts which were not the same were not determined. 
Cercospora achyranthis Syd. 
On Achyranthis aspera, Guanica, 333, Hormigueros, 459a, 
Bayamon, 459. The type of this species was described from 
Japan and in some respects differs from the Porto Rican ma- 
terial, particularly in the length of the conidiophores and 
shape and character of the spot. 
Cercospora alternantherae E. & L. 
On Alternanthera portoricensis, Yauco, 3273, Coamo, 3976, 
820, 8479. 
Cercospora gilbertii Speg. 
On Iresine paniculata, El Alto de la Bandera, 8286. This 
specimen differs from Spegazzini’s description in that the spots 
are not pellucid, the spores too, are a trifle thicker. 
Cercospora bixae, A. & N. 
On Bixa orellana, Mayaguez, 56, Lares, 4845, Rosario, 
3795. The last number also bears spots of entirely different 
character, small, with white center and purple border. In 
these is a Cercospora which appears quite different from C. 
bixae. On account of sparcity of material it is not described. 
Cercospora biformis Petch. 
