100 MINNESOTA BOTANICAL STUDIES. 



8. DICRANOPHORA Schroeter. Jahresb. Schles. Ges. 



Vaterl. Cultur. 64:198. 1886. (ex. Fischer.) 



Sporangiophores richly branched, ending in principal spor- 

 angia or in dichotomous branches which bear secondary- 

 sporangia. Secondary sporangia one or two spored, with a 

 two or three pronged columella. 



The only species, D. fulva Schroet. is known only from 

 Schroeter's descrij)tion and his figure in Engler u. Prantl, 

 PJlanzenfam. 



Tribe Piloboleae. 



Membrane of sporangium of two parts; the upper culicular- 

 ized and permanent, the lower thin and quickly disappearing. 



9. PILAIRA Van Tieghem. Ann. Sc. Nat. vi. 1 : 51, 1875. 



Mycelium without swellings; sporangiophores simple, arising 

 singly from the mycelium, terminating in a sporangium with- 

 out a subsporangial swelling; sporangia round, with a broad 

 columella, many spored, the membrane above cuticularized, 

 black, not dissolving or splitting, below colorless, soon swelling 

 up and setting the upper portion free from the columella. 



No species are reported for this country. The most widely 

 distributed species is: 



Pilaira iinietaria (Lk.) 



Mucor fimetarius Lk. Obs. 1 : 30 1809. 

 Hydrophora jimetaHa Fkies. 1829. 

 PUobolus anommlus Cbsati. 1871. 

 Pilaira cesatii Van Tieghem. 1875. 

 Pilaira anomala (Cesati) Schroeter. 1886. 



10. HYDROGERA Wiggers Fl.Holsat. 110. 1780 (ex. Kuntze.) 



PUobolus TODE. 1874. Schr. Naturf. Freunde Berlin 5: 46, (ex. 

 Fischer.) 

 Sporangiophores simple, arising singly from swellings in the 

 mycelium, colorless or orange, above expanding into a large 

 ellipsoid swelling; sporangia hemispherical or lens shaped, 

 many spored, the membrane above black and cuticularized. the 

 lower half quickly disappearing and leaving the upper part 

 resting on the conical columella, thrown off at maturity by ten- 

 sion of the terminal swelling of the sporangiophore. Zygo- 

 spores naked, borne on tong shaped branches. 



