186 THE ASCOMYCETES 



Classification. The monograph by de Jaczewski (1895) of 

 the Dothideaceae of Switzerland and that by Theissen and Sydow 

 (1915) constitute the most important ones available to present- 

 day students. 



LITERATURE CITED 



Blaix, W. L., "Comparative morphology of Dothideaceous and kindred 



stromata," MycoL, 19: 1-20, 1927. 

 Farlow, W. G., "Black knot," Bull. Bussey hut., i; 440-453, 1876. 

 Jaczewski, A. de, "Les Dothideacees de la Suisse," Bull. soc. mycol. France, 



11: 155-195, 1895. 

 KiLLiAN, C, "Le developpement du Dothidella uhiii (Duv.) Wint.," Rev. 



gen. botan., 52:534^551, 1920. 

 Koch, L. W., "Investigations on black knot of plums and cherries. II. The 



occurrence and significance of certain fungi found in association with 



Dibotryon morbosinn (Schw.) T. and S.," Sci. Agr., 13: 80-95, 1934. 

 III. "Symptomatology, life history, and cultural studies of Dibotryon 



morbosinn (Schw.) T. and S.," Sci. Agr., 25:411^23, 1935. 

 Orton, C. R., "Studies in the morphology of the Ascomycetes. I. The 



stroma and compound fructification of the Dothideaceae and other 



groups," MycoL, 16:49-95, 1924. 

 THErssEN, F., AND H. Sydow, "Die Dothideales," Ann. MycoL, 13: 149-746, 



1915. 

 Wolf, F. A., "iMorphology of Polythrincium, causing sooty blotch of 



clover," MycoL, 21: 58-73, 1935. ' 

 Wolf, F. A., and W. J. Barbour, "Brown-spot needle disease of pines," 



Phytopathology, 52:61-74, 1941. 



Hypocreales 



The Order Hypocreales comprises those Pyrenomycetes whose 

 perithecia are soft textured and brightly colored. xApproximately 

 1750 species, distributed among over 60 genera, are included in 

 this group. Nearly all of them subsist on plant tissues, either as 

 parasites or saprophytes; certain genera, however, notably Cor- 

 dyceps and Sphaerostilbe, contain entomogenous species. In 

 Hvpomyces are included species that parasitize Hymenomycetes; 

 and in Claviceps, species that transform the ovaries of various 

 grasses into sclerotia that, if consumed, are poisonous to man or 

 domestic animals. 



No satisfactory classification of Hypocreales is possible at this 

 time. Some workers regard the group as belonging to 1 family, 

 some to 2 families, and some to 3 families. Seaver (1910) em- 



