Davis — Parasitic Fungi in Wisconsin — I. 89 



sporules in a discoid layer 100-150/* broad which is covered by 

 a chitinoid, punctulate clypeus which becomes irregularly fis- 

 sured ; sporules straight or allantoid, 6-10 x ^-l 1 /^- North 

 American Fungi 674 on Betula lenta, collected by Nuttall in 

 West Virginia, shows faded leaves with circular green areas. 

 The pycnidia, however, are by no means confined to the green 

 spots. In the West Virginia specimens also the sporules are 

 smaller than in the type as described. I assume that it repre- 

 sents it in its Sacidium structure. Perhaps this is not distinct 

 from Leptothyrium betulae Fckl. 



(This has since been collected on the same host at Wausaukee.) 



A Gloeosporium which has appeared in the greenhouse of the 

 botanical department at Madison on the leaves of Dendrobium 

 moschatum causes orbicular arid spots about 1 cm. in diameter 

 with a dark purple border and elevated margin. The acervuli 

 are brown, scattered, mostly epiphyllous; the sporules oblong 

 to ovate-oblong, obtuse at both ends, biguttulate, 10-15x4/*. Prob- 

 ably this is Gloeosporium cinctum B. & C. and perhaps also Gl. 

 pallidum Karst. & Har. The studies of Shear and Wood, how- 

 ever indicate that it is a conidial condition of Glomerella cingu- 

 lata (Stonem.) S. & V. S. (U. S. Dept. of Agr., B. P. L, Bull. 

 252). 



Colletotrichum helianthi n. sp. Spots definite, orbicular, 

 olivaceous with a cinereous center and a black margin, paler be- 

 low, often confluent, 3-5 mm. in diameter; acervuli very promi- 

 nent, one or few on a spot, 50-65/* broad, surrounded by black 

 rigid bristles 80-150x3-5/* which taper from base to apex; spor- 

 ules hyaline, fusiform to arcuate, nucleolate, acute at each end, 

 25-35x2 1 /2-3 1 /2*i~ On Helianthus sp. indet. Madison, Wisconsin, 

 July 7, 1907. This is allied to C. solitarium Ell. & Barth. from 

 which it differs in the larger bristles and sporules. I found the 

 specimen in the herbarium of the University of Wisconsin with 

 the name of the collector not given 



Ovularia asperifolii Sacc, var. lappulae n. var. Spots sub- 

 orbicular, dark brown, ^-1 cm; conidiophores hypophyllous, 

 scattered or in tufts of 2-A, hyaline, often toothed, usually 16- 

 20x3^1/*; conidia in chains which are sometimes branched, hya- 

 line, 6-18x3-4/" ; the lower conidia are cylindrical, acute at each 

 end, 12-18x3-3y 2 /*, the upper fusoid, 6-12x3-3y 2 /*. Much 



