Phylum:Zygomycota >> Class: Zygomycetes >>  Order: Glomales 
 BCRC Number NO BCRC Number!  
 Scientific Name: Sclerocystis taiwanensis

Sclerocystis taiwanensis Wu & Chen, Trans. Mycol. Soc. Rep. China 2: 73-83. 1987.

 Description: Sporocarps reddish brown, brown or dark brown, globose, subglobose or ellipsoidal, 200-300 × 180-280 μm, with chlamydospores formed radially in a single, tightly packed layer around a central plexus of hyphae. Peridium lacking. Chlamydospores 40-85 (-105) × (17.5-) 22-42.5 (-55) μm, clavate, cylindro-clavate, triangular or irregular, with or without a septum at the spore base. Chlamydospore wall laminate or single, with a hyaline, separable outer layer (ca. 1 μm), yellow, yellow- brown, sometimes olive-brown, (4-)7.5-22.5 (-25) μm thick at the apex, 1.5-5 μm thick at the sides, generally thickest at the apex.

1. Taiwan: Chi-tou, Holotype, from the rhizosphere of Crassocephalum rabens (Juss. ex Jacq.) S. Moore, Wu-8508205; 2. Taiwan: Chi-tou, from the rhizosphere of Colocasia formosanum, Wu-8607154; 3. Taiwan: Taipei, from the rhizosphere of unknown host, Wu-850810; 4. Taiwan: Tainan, from the rhizosphere of orange (Citrus sinensis Osb.), Wu-850724.

 Habitat: Rhizosphere of Crassocephalum rabens (Juss. ex Jacq.) S. Moore, Colocasia formosanum, unknown host, orange (Citrus sinensis Osb.).





C. G. Wu

 Note: Sclerocystis taiwanensis is very similar to S. rubiformis. However, the spores of former species are tightly packed around a central plexus which is formed by the fusion of more than one monohyphal stalk. Spores of the latter are only loosely arranged around a broad, thick-walled stellate cell. Sclerocystis taiwanensis was recently isolated from Korea (Koo et al., 1992; Eom et al., 1992) and Philippines (personal communication). Keys to the species of Sclerocystis 1. Sporocarps not enclosed in a peridium 2 1. Sporocarps enclosed in a peridium 4 2. Sporocarps with a monohyphal stalk; chlamydospores raidally arranged on a broad, thick-walled plexal cell S. rubiformis 2. Sporocarps with more monohyphal stalks; plexus not a broad, thick- walled cell; chlamyspores thightly arranged side by side 3 3. Sporocarps relatively small, <300 μm; chlamydospore with a separable hyaline outer wall S. taiwanensis 3. Sporocarps large up to 800 μm; chlamydospore without a separable hyaline outer wall S. clavispora 4. Peridium composed of a layer of club-shaped cells S. liquidambaris 4. Peridium composed of interwoven hyphae 5 5. Sporocarps not hemispherical; peridium showing sinuous feature; if indistinct, spores with varialbe thickness S. sinuosa 5. Sporocarps hemispherical, with a hyphal stalk, which may connect into a column or branched appearance S. coremioides