Zygomycetes: Sigmoideomyces

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Sporulating heads more or less globose, sessile; fertile hyphae coenocytic initially, septate when mature, composed of coiled hyphae that bifurcate, one branch becoming a sterile spine, all sterile spine apices free, and the other continuing to grow; at each branching point, except the last 1 or 2, two stalks are produced each bearing a globose fertile vesicle covered with spores. Merosporangia globose to obovoid, unispored, ornamented, pedicellate. Zygospores unknown. Possibly a haustorial parasite.

Type species:S. dispiroides

Species ofSigmoideomyces:
S. divaricatusMcLean, 1923 (Trans. Brit. Mycol. Soc. 8:246) emend. Benny, R.K. Benjamin & P.M. Kirk, 1992 (Mycologia 84:629) (Benny et al., 1992; Mclean, 1923).
S. dispiroidesThaxter, 1891 [Botanical Gazette (Crawfordsville) 16:22] (Benny et al., 1992; Thaxter, 1891).

Sigmoideomycesis similar toReticulocephalisexcept that the apices of the sterile spines are free (vs. adherent) and the sporangiolar walls are ornamented (vs. smooth).Sigmoideomyces dispiroideshas been collected in northeastern North America whereasS. divaricatusis known from the northeastern United States and the United Kingdom (Thaxter, 1891; McLean, 1923; Benny et al., 1992). As far as is known, no species ofSigmoideomyceshas been successfully cultivated.


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