| Phialastrum | |
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| Genus: | Phialastrum Sunhede
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| Type species | |
| Phialastrum barbatum (Dissing & M. Lange) Sunhede
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Phialastrum is a genus of fungi in the family Geastraceae. A monotypic genus, it contains the single species Phialastrum barbatum, described by Sunhede in 1989.