698 ADDITIONAL EXERCISES 



Matted growth 2 cm. high. 5 M. advcnlitius Oudemans. 

 Columella with orange-red contents; variety auranliaca Lendner. 



6. Spores mixed with oil drops and intersporal granular protoplasm. 6 M. 

 plasmaticus van Tieghem. 



Without drops of oil in the sporangium. (7) 



7. Sporangiophores 2 to 3 cm. long. (8) 

 Sporangiophores more than 3 cm. (9) 



8. Sporangia 8om diameter, columella oval, spores 8^ by lo^i (except 8 by 14). 

 7 M. hiemaUs Wehmer. 



Sporangia larger than 250 to 3 50M, columella pyriform, large, spores 4 to 8m 

 by 5 to 13m- 8 M. piriformis Plscher. 



9. Wall of sporangium ruptured rapidly, columella frequently with yellow con- 

 tents, spores 3 to 6m by 6 to i2m. 9 M. mucedo Linn. (Fig. 13). 



Wall of sporangium ruptured slowly, columella colorless, spores very large, 

 ISM by 30 to ^^n. 10 M. mucilagineus Brefeld. 



2 Group Racemo-Mucor . 

 Branching indefinite, in racemes or in corymbs. 



1. Branching secondary verticillate, these last have at their nodes the verticil- 

 late branches. 11 M. glomerula Lendner (Bainier). 



Branching open in racemes, or in corymbs. 



2. Columella hemispheric, covered with colorless threads resembling the capil- 

 litium of certain Myxomycetes. 12 M. comatus Bainier. 



Columella round or oval, never presenting capillitial character, (3) 



3. Sporangiophore at first erect, then curved toward the substratum, and then 

 fading. 13 M. de Baryanus Schostakowitsch. 



Sporangiophores always erect and forming a matted growth. (4) 



4. Species parasitic on other Mucorace^. 14 M. parasiticus Bainier. 

 Species not parasitic. (5) 



5. Sporangiophores of two kinds, one with a terminal large sporangium with 

 diffluent wall, the others lateral, bearing sporangioles with persistent walls. 

 15 M. agglomeratus Schostakowitsch. 



Species not possessing the above characters. (6) 



6. Sporangiophores bearing laterally the branches with normal sporangia 

 (or abortive), or with zygospores. 



Suspensors unequal. (7) 



Sporangiophores normally laterally (i.e. all terminated by sporangia). 



Zygospores with suspensors approximately equal. (8) 



7. Sporangiophores straight, simple or branched bearing one or two opposite 

 branches terminated by sporangia. Columella depressed, spores elliptic 2 to 

 ;in by 4 to 5m. 16 M. Moelkri Vuillemin (Fig. 241). 



Sporangiophores straight, branched, bearing verticillately two to four 

 sporangia, columella roundish, spores spheric 2 to 2>t^ diameter, it M . 

 heterogamus Vuillemin. 



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