698 ADDITIONAL EXEECTSES 



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

 Columella with orange-red contents; variety amaiUiaca Lendner. 



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

 plasmalicus 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 80^1 diameter, columella oval, spores 8m by iom (except 8 by 14). 

 7 i[. hUmalls Wehmer. 



Sporangia larger than 250 to 35011, columella pyriform, large, spores 4 to 8/» 

 . by 5 to 13/1. 8 M. piriformis Fischer. 



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

 tents, spores 3 to 6|i by 6 to 12^. 9 M. mucedo Lum. (Fig. 13). 



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

 15/1 by 30 to i^ii. 10 M. mucilagineus Brefeld. 



■> Group Racemo-Mncor 

 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 .If. comalus 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 alwaj's erect and forming a matted growth. (4) 



4. Species parasitic on other Mucokacile. 14 3/. parasiticus Bainier. 

 Species not parasitic, (s) 



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

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

 15 M. agglomeratus Schostako?ntsch. 



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 

 ill. by 4 to 5m- 16 M. Moelleri Vuillemin (Fig. 241). 



Sporangiophores straight, branched, bearing verticillately two to four 

 sporangia, columella roundish, spores spheric 2 to 3/i diameter. 17 Af. 

 heterogamiis Vuillemin. 



