HETEEOSPOEIUM. 417 



Cercospora coneentrica, 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. filamentoga, in 

 gardens. 



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



Fertile hyphae, 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. 



Seterosporium, Elotzsch, Herb. Myc, i. n. 67 ; Cke., Grev., 

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



Besembling Helminthosporium 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 /t, 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 /n. 



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

 Syll., iv. n. 2311. 



Helminthosporium echinulatum. Berk., Gard. Chron., 1870, 

 p. 382. 



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

 and 643. 



On leaves of species of Dianthus. 



Heterosporium variabile. Cke. 

 Forming distinct, small, more or less circular, densely- 

 velvety, dusky olive patches ; hyphae slender, 5-6 jj. thick, 

 VOL. in. 2 E 



