Phylum:Zygomycota >> Class: Zygomycetes >>  Order: Mucorales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Choanephora cucurbitarum

Choanephora cucurbitarum (Berk. & Rav.) Thaxter, Rhodora 5: 102. 1903.

Basionym: Rhopalomyces cucurbitarum Berk. & Rav., Grevilla 3: 109. 1875.

 Description: Hyphae 2.6-8.3 µm in diameter. Dried weight of “+” strain (strain No. 046-1) 0.3241 gm and “_” strain (strain No. 033) 0.3038 gm after 5days’ culture. Conidiophores with primary vesicle from which secondary vesicles produced on short stalks. Secondary vesicles detached from the primary vesicle after conidia maturing. Conidia brown, fusiform with conspicuous striations, “+” strain 9-20 µm and “_” strain 11-19 µm. Sporangia globose, dark brown with ornamentations on the wall, “+” strain 66-160 µm and “_” strain 65-131 µm. Sorangiospores oval with stiff bristle-like appendages on both ends, “+” strain 13-31 × 12-25 µm and “_” strain 11-29 × 9-13 µm. Zygospores dark, 37-76 × 31-72 µm with density of 64-1200/cm² on malt extract agar and 34-89 × 30-88 µm with density of 16-50/cm² on potato dextrose agar.

Taiwan, Houlong: from fading flowers of Luffa cylindrica. L, 26 Sep. 1985, culture strains 033, 033-1 and 033-2; from fading flowers of Coreopsis tinctori, 01 Sep. 1985, culture strains 046, 046-1, 046-2 and 046-3; from decayed fruits of Cucumis melo var. makuwa, 08 Sep. 1985, culture strains 044, 044-1, 044-2, 044-3. Nantow: from soil under trees of Paulowania fortunei in Lwanda seed farm, 03 Aug. 1985, culture strains 0323.

 Habitat: Saprobic in soil and on plant debris. On fading flowers of Luffa cylindrica (L.) Roem. and flowers from many other woody plants, such as: Pyrus sp., Hibiscus rosaesinensis L., Hibiscus tiliaceus L., Hibiscus schizopetalus Hook. f. as well as herbaceous plants, such as: Coreopsis tinctoria L. and Solanum sp.; on decayed fruits of Cucumis melo L. var. makuwa; and from soil under trees of Paulowania fortunei Hemsl. and Carica papaya L. from Taiwan.

Cosmopolitism as well as from north to the mid-south areas of Taiwan, such as: Taipei, Banchiau, Sanchong, Taoyuan, Houlong, Nantou and Yunlin.


Wu, ML and Chien, CY. 1980; Wu, ML. 1975.


M. L. Wu

 Note: Choanephora cucurbitarum (Berk. & Rav.) Thaxter, Choanephora conjuncta Couch and Choanephora infundibulifera (Currey) Sacc. can form zygospores among interspecies no matter the morphologies of the sporangiospores and conidia are different with each other (Wu and Chien, 1980). It possess rapidly growing mycelia which are white when young and become yellow with age.