414 FUNGUS-FLORA. 



Brachysporium obovatum. Sacc. (fig. 16, p. 397.) 



Forming dense black velvety patches, hyphae erect, simple, 

 septate, subulate, base slightly incrassated ; conidia apical, 

 solitary, obovate, 2- septate, slightly constricted at the septa, 

 brown, upper cell large, rounded at the free end, lowest cell 

 minute, acute, 23-26 X 11-14 /*. 



Brachysporium obovatum, Sacc., Syll., iv. n. 2052. 



Helminthosporium obovatum, Berk., Ann. Nat. Hist., n. 232, 

 t. xiii. f. 19. 



On rotten wood. The conidia are opaque and black and 

 highly polished, shining like black glass beads when exa- 

 mined in situ under a 1-in. objective. 



Brachysporium tingens. Sacc. 



Forming slightly effused, thin black patches that tinge 

 the matrix of a purple colour; hyphae long, rigid, erect, 

 septate, simple, cells short, brown ; conidia generally termi- 

 nal, elliptic-clavate, 3 or rarely 4-septate, paler than the 

 hyphae, epispore thin, 30 X 10 p.. 



Brachysporium tingens, Sacc., Syll., iv. n. 2053. 



Helminthosporium tingens, Cke., Grev., vii. p. 37. 



On rotten wood, Eemarkable for imparting a purplish 

 tinge to the matrix. 



Brachysporium biseptatum. Sacc. & Eoum. 



Tufts minute, black, hyphae fasciculate, filiform 300 X 10 ft, 

 septate, almost straight, rounded at the tip, deep smoky- 

 brown ; conidia elliptical, 25-30 x 15 ft, rounded at both 

 ends, 2-septate, not constricted, smooth, smoky-olive. 



Brachysporium biseptatum, Sacc. & Eoum., Mich., ii. p. 641 ; 

 Sacc., Syll., iv. n. 2061. 



On putrid stems. 



Brachysporium ellipticum. B. & Br. 



Tufts black, very minute; fertile threads short, erect, 

 simple or rarely forked above, septate, dark and opaque 

 below, paler upwards; conidia elliptical, smooth, brown, 

 1-septate at maturity, terminal, sometimes 1-2 also spring 

 from minute lateral spicules near the apex, 12-15 x 6 ft. 



Monotospora elliptica, B. & Br., Ann. Nat. Hist., n. 1909, 

 t. iii. fig. 4. 



On dead herbaceous stems. 



