406 FUNGUS-FLORA. 



Helminthosporium capitulatum, Corda, Icon. Fung., ii. p. 13, 

 t. x. f. 58 ; Sacc., Syll., iv. n. 1925. 

 On wood of Tilia, &c. 



Helminthosporium molle. B. & C. 



Soft and velvety, black; hyphae simple, septate, wavy, 

 more or less nodulose, obtuse; conidia oblong or elliptic- 

 oblong, 3-5-septate, both ends obtuse, 20-30 X 4-5 p,. 



Helminthosporium molle, Berk. & Curt., N. Amer. Fung., 

 n. 633; Sacc., Syll., iv. n. 1942. 



On branches of holly (Ilex), Passiflora, &c. 



Helminthosporium exasperatum. B. & Br. 



Hyphae fasciculate, flexuous, nodulose upwards ; conidia 

 springing from the nodes, cylindric-oblong, ends rounded, 

 3- septate, 30-45 X 10-12 /A, smoky olive, base apiculate. 



Helminthosporium exasperatum, B. & Br., Ann. Nat. Hist., 

 n. 1380, t. vii. f. 4; Sacc., Syll., iv. n. 1945. 



On stems of Dianthus and Silene. 



Helminthosporium parvum. Grove. 



Thinly gregarious, brownish-black ; hyphae erect, septate, 

 pale brown, slender, straight, the base sometimes rather 

 incrassated, 80-90 X 3-4 /*, bearing at the apex a single 

 (rarely 2) conidium; conidia oblong, 2-septate, 12-15 X 

 5-6 fi, apical cell somewhat quadrate and the basal one 

 wedge-shaped, pale yellowish, central cell larger, rounded, 

 brown. 



Helminthosporium parvum, Grove, Journ. Bot. 1886, p. 203, 

 t. 267, f. 4; Sacc., Syll., Suppl. vols. i.-iv. n. 3626. 



On oak wood. 



Apical cell of conidium sometimes brownish, basal cell 

 always pale. 



Helminthosporium minimum. Cke. 



Thinly effused, black; threads simple, erect, septate, 

 rather thicker than the diameter of the conidia; conidia 

 fusiform, obtuse at the ends, 3-septate, scarcely constricted, 

 hyaline, 12-14 x 3-4 /*. 



Helminthosporium minimum, Cooke, Grevillea, vol. xvi. 

 p. 80. 



On dead decorticated branches. 



