Phylum:Zygomycota >> Class: Zygomycetes >>  Order: Mucorales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Thamnostylum piriforme

Thamnostylum piriforme (Bain.) von Arx & Upadhyay, in von Arx, The genera of fungi sporulating in pure culture, p.247. 1970.

Basionym: Helicostylum piriforme Bain., Bull. Soc. Bot. Fr. 27: 227. 1880.

 Description: Colonies developing moderately rapidly on PDA, to ca. 9 cm in diam in 7 days at 24°C, hyphae reaching cover of the plate in 4 days; turf dense, colorless at first, pale gray to gray in age; strongly stoloniferous. Stolons arising from the substrate mycelium, hyaline at first, pale olivaceous to brownish in age, smooth, usually nonseptate, branched; forming clumps of rhizoid upon contacting the substratum or cover of Petri-dish and giving rise to erect sporophores; often bearing clusters of sporangiophores at irregular intervals. Rhizoids hyaline, becoming olivaceous to brown, usually nonseptate, branched. Sporophores arising directly from substrate mycelium or from stolon, simple or sympodially branched; hyaline at first, brownish in age, smooth, septate; the primary axis and its branches bearing a sporangium terminally or ending in a sterile spine; axis usually giving rise to one or more clusters of few to many sporangiola. Primary sporangia globose, 125-160 µm in diam, dark olive to dark brown; wall smooth, diffluent; columellae ovoid, 62.5-112.5 × 52.5-105 µm, hyaline to olivaceous, with basal collar and apophysis. Fertile vesicles arising singly or in a whorl surrounding a nodose enlargement of the sporophoral axis; producing small fascicles of pedicellate sporangiola over their entire surface. Sporangiolar pedicels 67.5-102 µm long, 2-4 µm wide bellow the apophysis, usually strongly recurved distally, dichotomously branched near the base, smooth, hyaline to subhyaline. Sporangiola subglobose to obpyriform, 21-25 (-30) µm in diam, wall hyaline, smooth, deciduous; columella hemispherical, up to 19 µm in diam, apophysis well defined. Sporangiospores alike in sporangia and sporangiola, smooth, ellipsoid, (4-)5.0-9 × 3.0-4(-6) µm. Zygospores not found. Heterothallic.

DR0101, from mouse dung, Taipei, Jan. 2001; STS0101, from soil, Taipei, Apr 2002; DMM0301, from mouse dung, Miaoli, Oct. 2002.

 Habitat: null



Benny, GL. and Benjamin, RK. 1993; Benny, GL et al. 1985; Ho, HM. 2002.


H. M. Ho

 Note: Thamnostylum piriforme is one of the most common species in the genus Thamnostylum and in the family Thamnidiaceae. It differs from other species of the genus Thamnostylum in having pyriform sporangiola including apophysis obpyriform, sporangiola arising from vesicles, fertile vesicles arising singly or in whorls encircling nodose enlargement of the sporophore, sporangiola arising in small fascicles, their pedicels dichotomously branched at the base (Benny and Benjamin, 1975). The present isolates posses the same characters with T. piriforme. Thus, the author identified these isolates as T. piriforme without doubt.