ORDER MUCORALES 



159 



Fig. 55. Mucorales, Family Piptocephalidaceae. (A-C) Syncephalis cornu van 

 Tiegh. (A) Sporangiophore. (B) Sporangia containing spores. (C) Germination of 

 zygospore. (D, E). Piptocephalis cruciata van Tiegh. (D) Branched sporangiophore. 

 (E) Terminal branches with sporangia borne on cruciate sterigmata. (F-I) Pipto- 

 cephalis freseniana de Bary, stages in zygospore formation. (J-L) Dispira americana 

 Thaxt. (J) General habit of fungus. (K) Head with not quite mature sporangia. (L) 

 Two mature sporangia on sterigma. (A-E, after van Ticghem: Ann. sci. nat. Botan., 

 6me ser., 1:5-175. F-I, after Brefeld: Botanische Untersuchungen iiber Schimmel- 

 pilze, Heft 1, 1-64, Leipzig, Arthur Felix. J-L, after Thaxter: Botan. Gaz., 20(12) :513- 

 518, Univ. of Chicago Press.) 



