KEY TO THE GENERA OF FAMILY ELAPHOMYCETACEAB 357 



Key to Some Genera of Family Myriangiaceae* 



Parasitic upon scale insects, but possibly eventually entering and parasitic upon 

 the tissues of the plant host. Basal stroma well developed, bearing one or 

 more disk-like ascigerous portions (ascomata) throughout whose tissues 

 the asci are scattered in no definite layers. On stems and leaves of various 

 plants, largely tropical. 

 Ascomata usually several; ascospores strongly muriform, hyaline or only pale- 

 colored. Myriangium 

 Ascoma usually single, with a narrower base; ascospores several times trans- 

 versely septate, occasionally one or two cells longitudinally divided, 

 hyaline or only pale-colored. Kusanoa 

 Parasitic within the tissues of leaves, stems, and fruits, or on their hairs, or in some 

 cases possibly parasitic upon fungi within the plant hosts. 

 Attacking only the hairs of the host plants, forming little ascomata, within 

 which only a few asci are produced ; ascospores mostly muriform, 

 Ascoma globular, with homogeneous tissue. Molleriella 

 Ascoma globular, strongly gelatinized except a few traversing brown hyphae. 



Nostocotheca 

 Ascoma flattened. Saccardinula 



Attacking the synnemata of Helostroma, and forming a disk-like or pulvinate 

 ascoma, attached by a narrow base. Ascospores strongly muriform and 

 dark-colored when mature. Cookella 



Parasitic within the tissues of the host plant. 



Ascigerous portion strongly developed outside the host tissue, spreading from 



a narrower base. Uleomyces^ 



Ascigerous portion not strongly di&tinct from the internal stromatic tissue, 

 sometimes barely rupturing the epidermis, or forming a well-developed ex- 

 ternal cushion. Asexual reproduction by acervuli characteristic of the form- 

 genus Sphaceloma. Elsinoe (Plectodiscella) 



Key to the Genera of Family Gymnoascaceae 



Hyphae of the ascocarp without appendages. 



Ascospores hyaline, yellowish or red. Arachniotus 



Ascospores brown to brown violet. Amaurascus 



Hyphae of the ascocarp with appendages. 



Appendages consisting of spines or prongs. Gymnoascus 



Appendages circinate. Myxotrichurn 



Appendages comb-like. Ctenomyces 



Key to the Genera of Family Elaphomycetaceae 



Ascocarps with sterile base. Ascoscleroderma 



Ascocarps without sterile base. Elaphomyces 



* This tentative key is modified from Theissen and Sydow (1917) and Arnaud 

 (1925). Further studies are needed to reveal whether the many genera ascribed to 

 this family are valid. 



5 The genera Myriangina, Myriaruiinella, and Kusanoopsis are probably closely 

 related to Uleomyces and Elsinoe and perhaps all five should be united in the one 

 genus Uleomyces 



