HETEROSPORIUM. 417 



Cercospora concentrica, Cke. & Ellis, Grev., v. p. 90 ; Sacc.^ 

 Syll., iv. n. 2302, 



Cercospora yuccae, Cke. in Grev., vii. p. 35. 



On half-dead leaves of Yucca gloriosa and Y. filameniosaj in 

 gardens. 



HETEEOSPORIUM. Klotzsch. (fig. 9, p. 397.) 



Fertile hypliae, erect, fasciculate, septate, simple or 

 branched, often nodulose, olive or blackish ; conidia ter- 

 minal or lateral, septate, olive, epispore minutely warted, 

 at first catenulate in some species, but soon becoming 

 free. 



Heterosporium, Klotzsch, Herb. Myc, i. n. 67; Cke., Grev., 

 V. p. 122 ; Sacc, SylL, iv. p. 480. 



Resembling Helmintliosporium in general habit and struc- 

 ture, in fact only distinguished by the minutely warted 

 conidia. Growing on fading leaves or herbaceous stems, on 

 algae, and fungi. 



* On Dicotyledons. 



Heterosporium echinulatum, Cke. 



Clusters small, often numerous, seated on brown spots,, 

 usually on the upper surface of the leaf ; hyphae fasciculate, 

 springing from a small aggregation of cells, 100-200 x 

 8-10 /A, dusky olive, nodulose above, septate ; conidia ter- 

 minal or lateral, springing from the nodes, olive, minutely 

 warted, 2-5-septate, cylindrical, constricted at the septa, 

 30-50 X 10-15 /x. 



Heterosporium ecliinulatum, Cke., Grev., v. p. 123; Sacc, 

 Syll., iv. n. 2311. 



Helminthosporium echinulatum, Berk., Gavd. Chron., 1870, 

 p. 382. 



Heterosporium dianthi, Sacc. et Eoum., Mich., ii. pp. 559 

 and 643. 



On leaves of species of Diantlms. 



Heterosporium variabile. Cke. 

 Forming distinct, small, more or less circular, densely 

 velvety, dusky olive patches ; hyphae slender, 5-6 /x thick, 

 VOL. III. 2 E 



