118 MEDICAL MYCOLOGY 



Mycelium colorless, sporangiophores brown, in branching cluster, some- 

 times terminating in an umbel, with small rhizoids at the base with a mecii 

 diameter of lO/i,; secondary pedicels, 3-4 in number, are short with crosswalls 

 at point of branching; sporangia pale grayish brown, spherical, transparent 

 membrane, smooth or slightly papillate, 32/x, in diameter ; columella also brown, 

 spherical or slightly ovoid, mean diameter of 27/*; spores spherical or ovoid, 

 smooth, clear yellowish or brownish, 2.5 - 4/a. 



Referred to Mucor racemosus by A. Fischer, and Lendner. It also resembles 

 M. hifidus Fresenius. It differs from R. parasiticus in smooth sporangial wall 

 devoid of crystals, sporangia smaller, and sporangiophores always septate. 



MORTIERELLA 



Mortierella Coemans, Bull. Acad. Sei. Belgique II, 15: 536, 1863. 



The type species is Mortierella polycephala Coemans. 



Mycelium within the substrate or forming a closely appressed weft over 

 its surface, not typically aerial; sporangiophores erect, simple or branched, 

 usually tapering to a delicate tip just below the sporangium, often swollen 

 below; sporangia spherical without columella, wall soon disappearing; stylo- 

 spores unicellular, spherical, echinulate, suggesting sporangia with a single 

 spore; zygospores enveloped by a thick layer of densely woven hyphae which 

 arise just below the gametangia and tend to obscure the details of conjugation. 



Mortierella niveovelutina Ciferri & Ashford, Porto Rico Jour. Publ. Health 

 & Trop. Med. 5: 134-143, 1 pi, 1929. 



Isolated from a Porto Rican with a patch of inflamed papules covering 

 the antero-extemal aspect of the right thigh and extending around behind, 

 ending below at the insertion of the adductor muscles. At first glance the 

 appearance reminded one of psoriasis, but when fading, the eruption became 

 discrete and parts once thickly studded with red nodules disappeared without 

 leaving a trace of the former thickly infiltrated red nodular area. Intense 

 pruritus present. Healed by the application of salicylic acid, ichthyol, and 

 sulphur ointment. 



Colony white, velvety ; mycelium of highly branched hyaline hyphae with 

 apical branches normally bifurcate, occasionally Avith three forks, continuous 

 or later scantily septate, with frequent and complex anastomoses, without 

 rhizoids, 2-3/i. in diameter; hypnospores in chains in liquid media, less abun- 

 dant in solid media, from spherical to elongate with a smooth membrane ; 

 stylospores or aerial hypnospores normally very abundant, singly or in chains 

 of up to 12 cells, generally 2-3/* in diameter with a smooth epispore ; sporangio- 

 phores 30-80/1 long, straight erect, of uniform diameter, never branched, con- 

 taining an apical septum immediately beneath the sporangium ; a single spo- 

 rangium for each sporangiophore, approximately spherical, 30-90/1 in diameter 

 normally about 60/i, irregularly dehiscent with smooth, diffluent membrane, in 

 part more or less firmly fixed in the sporangiophore ; numerous spores in each 

 sporangiophore (15-20 or more) elliptico-apiculate, with the extremities more 



