Synonymy:
Helicostylum piriforme Bainier, Bull. Soc. Bot. France 27: 227 (1880)
Thamnidium piriforme (Bainier) Mig., Rabenh. Krypt.-Fl., Edn 2 (Leipzig) 3(1): 207 (1910)

Thamnidium cyaneum Pound & Clem., Bot. Surv. Nebraska 4: [5] (1896)
Helicostylum cyaneum (Pound & Clem.) Sacc. & P. Syd., Syll. Fung. (Abellini) 14(1): 434 (1899)

Position in classification:
Thamnostylum, Syncephalastraceae, Mucorales, Incertae sedis, Mucoromycetes, Mucoromycota, Fungi

Note:
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