1894.] NATURAL, SCIENCES OF PHIIiADELPHlA. 388 



Hyphaj short, tufted, obovate-obloug, contiauous, 12-15 x 5-6//, 

 pale yellowish. Conidia clavate, 5-10-septate and muriform, 40- 

 120 X 20-25//, including the stout, cylindrical, persistent stipe. It 

 is possible that what we have taken for hyphge are tufts of young 

 conidia ; if so, the conidia ai"e sessile. This is quite distinct from 

 3Iarrosporium Iridis C. & E. 



The tufts are at first scattered and distinct but finally confluent, 

 forfiiiug pulverulent black patches consisting entirely of the free 

 conidia. 



Macrosporium Pelargonii E. & E. 



On leaves of Pelargonium (cult), Pasadena, Gala., Feb. 1894 

 (Prof. A. J. McClatchie). 



Spots orbicular, 1-3 mm. diam. , greenish at first, then rusty brown, 

 with a narrow, raised margin causing them to appear discoid. 

 HyphiB amphigeuous but more abuudant above, eff'used or sparingly 

 fasciculate, yellow- brown, erect, 2-3-septate, swollen at the tips, 25- 

 30 X 5-6'/, bearing' the terminal, obovate, or subquadrate, 3-septate, 

 and muriform, 20-30 x 18-22//. conidia, which are mostly constricted 

 at the middle septum and have no pedicel. 



Macrosporium tabacinum E. & E. 



On leaves of tobacco, North Carolina, Oct. 1891 (Prof. Gerald 

 McCarthy), INIissouri (Miss Clendinin). 



Spots amphigenous, numerous, small, irregular or suborbicular, 

 definite, thin, white, with a narrow, raised margin, 1-3 mm. diam. 

 Hyphpe amphigenous, fasciculate, tufts eff"used, septate, geniculate 

 above, ferruginous-brown, 30-50 x 3-4//, crooked and spreading. 

 Conidia obovate-clavate, stipitate, 3-9-septate and muriformly 

 divided, 50-90 x .0-15/'. The smaller conidia are often without 

 any stipe, while the larger ones have a persistent stipe from 8-25// 

 long. 



This is closely allied to 31. candatum C. & E. It is called by the 

 planters "white speck," and with Phyllosticta tabaci Pass, is very 

 injurious to the plants. 



Macrosporium olivaceum E. & E. 



Parasitic on Sphcvro-psis Asimince E. & E., on dead limbs of 

 Admina triloba, Nuttallburg, West Va., March, 1894 (L. W. 

 Nuttall, No. 388). 



Forms a light olive, veliitinous coat over the pustules of the 



