MUCORALES 



27 



Family 2. Mortierellaceae. 



10. Sporangiophores erect ; branches tapering at the apex. jMortierella. 

 Sporangiophores twining, forming numerous lateral branches every- 

 where equally thick. Herpocladieli.a. 



11. Conidia formed singly [i.e., not in chains); zygospores formed 



directly from the gametes. Fam.3. Choanophoraceae. 12. 



Conidia in chains ; zygospores developed at the apex of the arched 



gametes. Fam. 5. Piptocephalidaceae. 13. 



Family 3. Choanophoraceae. 



12. Sporangia present (One genus of East India species). CiiOANOriiORA. 



Family 4. Chaetocladiaceae. 

 Sporangia wanting (a somewhat common genus). Chaetocladium. 



Family 5. Piptocephalidaceae. 



13. Ends of the conidiophores on which the basidial cells rest of the same 



thickness as the branches. PiPTOCEPHAEis. 



End of the conidiophores enlarged, capitate. 14. 



14. Conidiophores not branched. Syncephalis. 

 Conidiophores branched. Syncephalastrum. 



Of the above, Mucor is the largest genus with some fifty species. 

 With the exception of Thainnidium, ten species, Pi/obo/us, seven 

 species, Mortierei/a, sixteen species, Piptocephalis, eight species, 

 and Syncephalis, seventeen species, most of the genera are small, 

 several of them consisting of a single species. 



LITERATURE. 



The literature of the most value in the systematic study of this 

 group is : 



Fischer. Loc. cit. 6, 7, 161-310. 



Schroeter, Loc. cit. i 19-134. 



Brefeld. Botanische Untersuchungen iiber Schimmelpilze, i : 

 1872 ; : 1881. 



Saccardo. Sylloge Fungorum, 7 : 182-233 ; 9 : 335-340 ; ii: 

 239-242. 



Van Tieghem et Le Monnier. Recherches sur les Mucorinees. 

 Ann. Sc. Nat. V. 17 : 261-399. PI. 20-2^. 1873. 



Van Tieghem. Nouvelles recherches sur les Mucorinees. Ann. 

 Sc. Nat. VI. I : 1-175. PI. 1-4. 1875. 



