Sporocarps globose, subglobose, brown to blackish brown, 300-600 × 400-700 μm, without peridium, usually with one to four monohyphal stalks; chlamydospores brown to dark brown, radially arranged on a central plexus, developed synchronous, or asynchronous, clavate to subcylindric, 22.5-75 × 47.5-157.5 μm; spore wall usually thickened at apex, up to 40 μm.
Specimens：
1. Taiwan: Chi-tou, from rhizosphere of Chimonobambusa quadrangularis (Fenzi) Markino, Wu-850821; 2. Taiwan: Chi-tou, from the rhizosphere of Erechthites valerianifolia (Walf.) DC., Wu-8508201; 3. Taiwan: Chi-tou, from the rhizosphere of Gingo biloba L., Wu-8508202; 4. Taiwan: Chi-tou, from the rhizosphere of Colocasia formosanum Hayata, Wu-8607151; 5. Taiwan: Kenting, from the rhizosphere of Colocasia formosanum, Wu-8605171; 6. Taiwan: Pingtung, from the rhizosphere of asparagus (Asparagus officinalis L.), Wu-860813; 7. Taiwan: Wu-feng, Taichung, from the rhizosphere of rice (Oryza sativa L.), Wu-920717.
Sclerocystis clavispora produces two distinctly different sized spores: one large (7000-8000 μm2) and the other small (2000-3000 μm2)(Fig. 19A). Both types of spores could be found in the same sporocarp or in different sporocarps isolated from the same rhizosphere. The sporocarps producing smaller spores formerly were identified as S. microcarpus (Iqbal and Bushra, 1980).
Chlamydospores sometimes developed asynchronously. In the same sporocarp, club-shaped vesicles (young spores) were often observed intermingled with mature, thick-walled spores (Fig. 4). Obviously, spore walls were thickened gradually at the apex and base. However, the factor which triggers the process of wall thickening is still unknown. It might be closely related to the production of two types of spores.
Phylum：Zygomycota >> Class： Zygomycetes >> Order： Glomales 
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