110 MEDICAL MYCOLOGY 



Key to Pathogenic Genera 



Sporangium containing a columella; zygospore not surrounded by a layer of interwoven 



hyphae; sporangioles not formed, sporangial wall thin, not cutinized. Miicoreae. 



Sporangiophores arising directly from the mycelium, suspensors lacking outgrowtlis ; 



gametangia essentially alike. Mucor. 



Sporangiophores arising from aerial arching stolons which develop rhizoids at points of 

 contact with the substratum. 

 Sporangiophores borne on the arching internodes of the stolons between the nodes; 

 sporangia pyriform ; zygospores, when present, vpith prominent circinate out- 

 growths. Absidia. 

 Sporangiophores arising in a fascicle from the node of the stolon; sporangia 

 spherical. Bhisopus. 

 Sporangium lacking a columella; zygospore where known enveloped by a thick layer of in- 

 terwoven hyphae; sporangioles and conidia formed in some cases, when present 

 isolated, not covering an enlargement on the sporangiophore or conidiophore ; 

 sporangiophore erect, tapering upward, usually not branched. Mortierella. 



MUCOR 



Mucor Micheli, NovaPlantarum Genera 215. 1729; Linne, Species Plan- 

 tarum 1185, 1753; Gray, Natural Arrangement of British Plants 1: 560, 1821; 

 Fries, Systema Myeologicum 3: 320, 1829. 



Type species : Mucor Mucedo L. 



Mycelium abundant both in and on the substratum, lacking stolons and 

 rhizoids ; sporangiophores occurring singly, erect, simple or occasionally 

 branched, each branch terminated by a sporangium which is large, spherical, 

 many-spored with an evanescent sporangial wall neither cutinized nor in- 

 crusted ; columella always present, variable in shape ; sporangiospores spheri- 

 cal to ellipsoid, with a thin, smooth wall ; zj^gospores borne on the mycelium, 

 suspensors lacking outgrowths ; chlamydospores present in some species termi- 

 nal or intercalary, smooth, hyaline ; oidia accompanied by fermentation found 

 in the submersed mycelium. 



At present there is little conclusive evidence that this typically saprophytic 

 genus is pathogenic for man. Most of the cases originally attributed to this 

 genus were based on misidentification of the organism and belong elsewhere. 

 For descriptions of species of this genus see the systematic accounts of A. 

 Fischer (1892), Lendner (1908), and Povah (1917). 



Mucor Mucedo L., Species Plantarum 1185, 1753. 



The case of Fiirbringer (1876) should probably be referred to Absidia 

 corymhifera. 



Mucor racemosus Fresenius, Beitr. z. Mycol. 12, 1850. 



Pleurocystis Fresenii Bonorden, Handb. Allgem. Mykol. 124, 1851. 



f Mucor scarlatinosus Hallier, Zeitschr. f. Parasitenk. 1: 117-184, 290-352, 

 Pis. 3, 4, 1869. 



Chlamydomucor racemosus Brefeld, Unters. Gesammtegebiet der Mykol. 

 8: 223, 1890. 



