Indiana Fungi — VII 233 



INDIANA FUNGI— VII. 



J. M. Van Hook, Indiana University. 



The plants described in this seventh paper on "Indiana Fungi", 

 have been collected, for the most part, during the seasons of 1922 and 

 1923. Though we are still concerned in listing all species new to us, 

 new to the state and new hosts, we are now primarily concerned in 

 making additions to present descriptions or in some instances, even 

 completely redescribing the species in the light of better material, 

 finding it extremely important to make collections throughout the season 

 rather than to be content with a single collection. The color and size of 

 spots and the host plant are often constantly changing. Our hope is 

 that we may not only be of assistance in reducing the number of species 

 names, but by extending our descriptions, to prevent some new species 

 from being named unnecessarily. It is very evident that the things left 

 unsaid in the so-called "one line descriptions", have been utilized too 

 freely in selecting characteristics for certain new species. It is a 

 great source of satisfaction to mycologists to note that our most recent 

 new species descriptions are very complete. 



Indiana offers one of the most fertile fields in the United States 

 for the study of fungi. Many of the wooded valleys of southern Indiana, 

 rich in the Agaricaceae, await the student of that group. Much of our 

 forest area is still in a primeval condition as far as fungi are con- 

 cerned, and many undescribed species still exist. Donaldson Farm, now 

 a part of Indiana University, retains all of its largest trees both living 

 and dead and therefore offers what is now the best forest collecting 

 ground in Indiana. 



Phycomycetes. 

 Plasmopara Geraniae (Pk.) Berl. & De Toni. On living leaves of 



Geranium maculatiini, Campus of Indiana University, June 1, 1922. 



Collected by Adams. No. 3920. 

 Peronospora parasitica (Pers.) De Bary. On living Lepidium Vir- 



ginicum, where it is especially noticeable in rings around the stems. 



Coll. Weatherwax. May 18, 1922. 3919. Monroe County. 



ASCOMYCETES. 



Calosphaeria princeps Tul. On dead peach limbs. Orange County, 

 January 1, 1921. Mcintosh. 3798. Fruit bodies seated beneath 

 outer bark on layers of inner bark. 



Caryospora putaminum (Schw.) DeNot. On old peach pit on ground. 

 May 17, 1923. Monroe County. 3945. 



Coccomyces Kerriae Stewart. On living stems and leaves of Ke.n-ia 

 Japonica, Campus, 1923. Kay. The conidial stage of this fungus 

 which is a Cylindrosporinm, appeared on the foliage early in July 

 causing defoliation. It immediately appeared as black blotches on 

 the canes where it persists. According to Stewart, the ascus stage 

 develops on these stems. (Phytopathology VII, pp. 399 to 407, 

 1917.) So far as we know, this is the first appearance of the 



"Proc. Ind. Acad. Sci., vol. 33, 1923 (1924)." 



