700 ADDITIONAL EXERCISES 



14. Large species 6 to 8 cm. tall (exceeding in all cases 2 cm.). (15) 

 Small species never exceeding 2 cm. in height. (16) 



15. Sporangiophores 6 to 7 cm. in height, sporangia 300 to 400/i (exceptionally 

 5oom), spores 7.5 by i7.5m- 25 M. proliferus Schostakowitsch. 

 Sporangiophores 6 to 8 cm. in height, sporangia 140 to 150^ diameter, 

 spores 4.2fi by 9 to 12^. 26 M. flavus Bainier. 



16. Columella largely subjacent and concrescent with the wall of the sporangium, 

 diameter looyu, spores 2 to 4^. 27 M. mollis Bainier. 



Columella free and slightly flattened at base. (17) 



17. Spores oval, small 2.1^1 by 4.2/^, a grayish-blue. 28 M . Jragilis Bainier. 

 Spores elongated plano-convex, unequal, 2 to 5yu by 5 to ion. (18) 



18. Sporangia never exceeding So/x, zygospores frequent, forming (on bread) 

 special branches. 29 M. genevensis Lendner. 



Sporangia a mean of 80// frequently 120^1 diameter, suspensors bearing the 

 sporangiophores as with M. racemosus (Fig. 30). 30 M. erectus Bainier. 



3 Group — Cymo-Mucor 



Sporangiophores branched in sympodial cymes. 



1. Sporangiophores of two kinds, the one straight and bearing the normal 

 • spheric Sporangia, the other creeping, circinate branches sympodial, bearing 



piriform sporangia. 31 M. pirelloidcs Lendner. 

 Sporangiophores of a single kind. (2) 



2. Sporangiophores circinate. (3) 

 Sporangiophores straight not circinate. (6) 



3. Sporangiophores never exceeding i cm., spores oval, maximum length 6/1- (4) 

 Sporangiophores exceeding i cm. sometimes 3 cm., spores spheric, lo^i or 

 more. (5) 



4. Wall of sporangium brown, sporangium frequently subsessile, spores 3 to 

 4n by s to 6/x long. 32 M. circinelloides van Tieghem. 



Sporangia wall bluish-black, sporangia carried on long pedicels, frequently 

 circinate, spores 4^1 by 5 to 6^. 33 M. griseo-cyanus Hagem. 



5. Sporangiophores creeping, Yz to 2 cm., sporangia black 120 to 2ooju, spores 

 10.5JU to I4M in diameter. 34 M. angariensis Schostakowitsch. 

 Sporangiophores straight not circinate, the others short, freely branched and 

 circinate, sporangia small 6om (mean), 12/i (maximum). 41 M. laniprosporus 

 Lendner (Fig. 242). 



6. Spores spheric or very unequal of diverse forms. 35 M. heterosponis sibiricits 

 Schostakowitsch. 



Spores spheric appreciably equal. (7) 

 Spores oval. (12) 



7. Species poorly cultivated on grape- juice gelatin, forming on bread a short 

 mat of 2 to 3 mm., sporangia 50 to 70/11, spores spheric, 5 to 6ju. 36 M. 

 Jansseni Lendner. 



Species readily cultivated on grape-juice gelatin, forming a taller matted 

 surface (i to 3 cm.). (8) 



