576 



DEMATIEI. 



1729. Helminthosporium ireticulatum. Coole. "Eeticulate 



Helminthosporium." 



Forming dendritic and reticulated patches on both surfaces 

 of the leaves, orbicular or irregular ; flocci slender, flexuous, 

 generally simple; spores elliptical, obtuse, triseptate. — Coolce. 

 exs. no. 360. 



On dead leaves of ash. Dec. 



This species has more the appearance of an Asteroma than an Helminthos- 

 porium to the naked eye. In habit, at least, it is very distinct. 



Gen. 212. 



MACROSPORIUM, Fries. 



Flocci obscure or delicate ; spores 

 erect, basal, pedicellate, with at length 

 transverse and vertical septa. — Berk. 

 Outl. p. 345. EngFl. Y.p 339. 



{Fig. 247.) 



Fig. 247. 



1730 IWEacxospoEium. cheiranthi. Fr. " Common Macroa- 



porium." 



Flocci decumbent, extremely fugacious ; sporidia pyriform, 

 articulato-septate, black; peduncle short. — Fr. S.M.Yii.p. 374. 

 £'w^.i^/.v.j9. 339. 



On damp paper, decaying plants, &c. [United States.] 



var. /3. betae. Coohe. Spores scarcely coloured. — Cooheexs. 

 «o. 197. M aero sporium commune. Rahh. F.E. no. 13Q0. 



On leaves of beet. 



The sporidia vary extremely in form, some are clavate, with a single row 

 of articulations, in others the two or three upper cells have a vertical sep- 

 tum ; others are broadly clavate, and others again obovate, each articulation 

 divided by vertical parti,tions into many cells. All are more or less con- 

 stricted. The flocci are very delicate, and difficult to detect, though cer- 

 tainly present. The peduncles vary in length ; more than one are sometimes 

 given off by the same thread of the mycelium. — 31. J. B. Probably a condi- 

 tion of Sphoeria herhanim. 



1731. Macrosporium saircinula. Berk. " Gourd Macros- 



porium." 



Flocci suberect, delicate, fugacious, slightly branched; spores 



