136 



Mycologia 



but later says that he made a mistake in the examination of the 

 spores. Link suggested verbally to him the name Mucor fusiger 

 which Ehrenberg prefers and accepts but according to the rules 

 of priority the former name must be retained. 



Substrata : On decaying agarics. 



Specimens examined: Pennsylvania, Sumstine. 



Illustrations: Van Tieghem, /. c. pi. i, f. ^p-J/; Bainier, 

 Etude, pi. J, /. 1-13. 



2. Spinellus macrocarpus (Corda) Karst., Myc. Eenn. 4: 73. 



1878 



Mucor macrocarpus Corda, Ic. Fung. 2: 21. 1838. 



This species differs from the other chiefly in spore character as 

 shown in the key. 



Substrata : On decaying agarics. 



Specimens examined : Pennsylvania, Sumstine. 



Illustration : Corda, /. c. pi. 12, f. 84. 



6. Hydrogera Web. and Wigg., Prim. El. Holsat. no. 



1780. 



Pilobolus Tode, Schrift. Gesell. Naturf . Ereunde Berl. 5 : 46. 

 1784. 



Type species, Pilobolus crystallinus (Web. and Wigg.) Tode. 

 Original description : Capsula humido aquoso repleta, pileo 

 hemisphaerico tecta. 



Type species, Hydrogera crystallina Web. and Wigg. 



Sporangiophores simple, erect or oblique, colorless or with 

 orange colored contents, arising from swellings in the mycelium 

 and ending with ellipsoid swellings beneath the sporangium; 

 sporangia lenticular, with columella, membrane cuticularized 

 above but disappearing in the lower half; zygospores borne on 

 the mycelium, naked, with tong-shaped copulating branches. 



Key to the Species 



Spores elliptic. 



Spores small, 3-6 X 6-10 fi. i. H. obliqua. 



Spores variable, larger, 6-10 X 12-20//.. 2. H.Kleinii. 



Spores ellipsoid or nearly globose, 10-12 X 12-14 yu,. 3- H. longipes. 



Spores globose, variable in size. 4. H. Oedipus. 



