MUCORACEAE 13 



I. Sporangia similar 



1. Sporangiophore simple or branched, but not repeatedly dichotomous 



a. Suspensors without appendages at maturity 



(1) Aerial mycelium lacking 



(a) Sporangia single, terminal Mucor 7:190, S. 124 



(b) Sporangia clustered, lateral 



x. Sporangia globose Circinella 7: 215, S. 125 



y. Sporangia long pear-shaped Pirella 7: 216, S. 125 



(2) Aerial mycelium present 



(a) Aerial mycelium stoloniferous 



Rhizopus 7: 212, S. 125 



(b) Aerial mycelium with many short thorn-like branches 



Spinellus 7: 205, S. 125 



b. Suspensors with thorny appendages at maturity 



(1) Appendages spreading Phycomyces 7:204, S. 126 



(2) Appendages loosely enclosing the zygospore 



Absidia 7: 214, S. 126 



2. Sporangiophore repeatedly dichotomous 



Sporodinia 7: 206, S. 127 



II. Sporangia of two sorts, primary and secondary 



1. Primary sporangia with, secondary without columella 



Thamnidium 7:211, S. 127 



2. Both kinds of sporangia with columella 



Dicranophora 11: 240, S. 128 



Subfamily Pilobolae 



7 : 184, S. 123 



Mycelium similar throughout ; sporangia alike, with columella, sporangial wall 

 cuticularized and persistent above; zygospores naked. 



I. Sporangiophore equal, sporangium not thrown off 



Pilaira 7: 188, S. 129 



II. Sporangiophore swollen above, sporangium thrown off 



Pilobolus 7:184, S. 129 



Subfamily Mortierellae 

 7 : 184, S. 130 

 Sporangia similar, terminal, without columella ; conidia single, spherical on short 

 lateral branches of the aerial mycelium ; zygospore enclosed in a dense mass of hyphae 

 arising from the suspensors. 



I. Sporangiophores erect, branches attenuate toward tip 



Mortierella 7: 220, S. 130 



II. Sporangiophores creeping, branches equal 



Herpocladiella 7: 225, S. 130 



Subfamily Choanophorae 



9: 339, S. 131 

 Mycelium parasitic on plant parts ; sporangia and conidia both present ; conidio- 



