Sumstine: North American Mucorales 145 



Specimens examined : Pennsylvania, Sumstine. 



Diagnosis: Hyphae sporangi ferae simplices, non ramosae, 

 erectae, candidae, 5-15 mm. altae; sporangia magna, Candida, 

 viridi-flava, sphaerica; columella cylindrica; sporae variae in 

 magnitudine, ellipticae, 6-12 fx. 



Hab. In bubula. 



12. Helicosotylum Corda, Icon. Fung. 5: 18, 55. 1842 

 Original description : Hyphasma decumbens, ramosum, con- 

 tinuum. Stipes erectus spiraliter incurvatus, simplex, continuus, 

 dein deciduus. Sporangium acrogenum, membranaceum, stipite 

 adfixum dein deciduum, rumpens. Columella nulla. Sporae 

 irregulariter conglobatae continuae, episporio simplici, nucleo 

 firmo, guttulis oleosis repleto. 



Type species, Helicostylum elegans Corda. 



Sporangiophores erect or decumbent, terminated by a spo- 

 rangium with a columella; branches spirally and irregularly 

 arranged along the sporangiophores, terminated by a sporangium 

 without columella. The zygospores are unknown. 



Species Reported 



I. Helicostylum cyaneum Pound and Clements, Bot. Survey 

 Neb. 4: 5. 1896. 



13. Calyptromyces Karst. Bot. Zeit. 20: 365. 1849 

 Pleurocystis Bonord. Hdbk. Allgemein. Myk. 124. 1851. 



Type species, Pleurocystis Fresenii Bonord. = MMcor race- 

 mosus Fres. 



Chlamydomucor Bref. Bot. Unters. 8: 228. 1890. 

 Type species, Mucor racemosus Fres. 



Original description : Peridiola globosa, membranacea, cir- 

 cumscissa, in floccis terminalia, nucleos centrales, persistentes, 

 sporidiaque includentia. Sporidia subglosa discreta. Flocci 

 tubulosi, erecti, septati ramosi vel simplices. Thallus ramosus, 

 vesiculis, farctus vel cellulosus. 



Type species, Calyptromyces ramosus Karst. 



Karsten was the first to establish a separate genus for branch- 

 ing Mucors. Two new species are described under this genus, 



