HETEROSPORIUM. 417 



Ccrcospora 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. filamentosa, in 

 gardens. 



HETEROSPORIUM. 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. 



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

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



Resembling 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 T 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 /A. 



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

 Syll., iv. n. 2311. 



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

 p. 382. 



Heterosporium dianthi, Sacc. et Roum., Mich., ii. pp. 559 1 

 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 p. thick, 



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