= Labyrinthomyces turbinatus Zhang & Minter (1988). Syst. Ascomycetum 7, 48.
Sporocarps up to 2-5 cm in diam., turbinate, napiform or ellipsoidal, with deep cracks, often with minute flattened polygonal warts, glabrous, brown and slightly red in some parts to dull brown, sometimes with an inconspicuous basal attachment. Gleba pale yellowish brown, with labyrinthine chambers, 0-5-3.0 x 0.4-0-6 mm, lined and at maturity with a hymenium of paraphyses, asci, and spores. Peridium 400-650 µm thick, (including warts 80-250 µm tall) two-layered; epicutis ± 100 µm thick, of pale brown, angular cells in places, interwoven hyphae elsewhere, the hyphae up to 13 µm in diam. with walls up to 2 fim thick; subcutis 300-550 µm thick, of hyphae 3-5 µm in diam. at septa, the cells inflated up to 10 (-20) µm. Trama tissue similar to that of subcutis. Asci 250-300 x 25-35 µm, cylindrical and tapering towards the base, 8-spored, walls 1-5 µm thick, non-amyloid. Paraphyses cylindrical, 4-5 µm in diam., hyaline, with rounded apices, equal in length to the asci or often elongated and anastomosing with paraphyses arising from the opposite side of the chamber. Spores (Fig. 1) globose, 18-25 µm in diam. excluding the cyanophilic ornamentation of scattered hemispherical warts 0.5-1.5 µm x 0.5-2 (-3) µm, smooth, hyaline in youth, pale brown at maturity, walls 2-5-3 µm thick.
Etymology: Latin turbinata (top-shaped), in reference to the shape of the sporocarps.
Presumptive Mycorrhizal Hosts: Unknown.

Etymology: turbinatus (Latin, "turbinate") describing the ascomaaal shape.

Notes on New Zealand Labyrinthomyces species
Labyrinthomyces phymatodeus differs from all other species in the subgenus in having ascomata with conspicuous warts on which parallel lines are present, and in having ascospores ornamented often with larger hemispherical warts. It also differs from L. varius and Labyrinthomyces sp. (PDD 48338) in having its glebal fertile chambers remaining filled with ascospores; from L. turbinatus in having dark brown ascomata which are not turbinate, but which have a thicker and differently structured peridium; and from L. tesselatus in having larger ascomata again with a thicker and differently structured peridium.
The dark brown, warty ascomata, the glebal structure and the distribution of L. phymatodeus made it so similar to the description of the monotypic genus, Dingleya Trappe (Trappe, 1979), that the specimen was found filed under the name "Dingleya sp." in K. Examination of type material, however, showed that ascospores of D. verrucosa Trappe (PDD) are ellipsoid, with an amorphous, ridged ornamentation. Labyrinthomyces phymatodeus is thus sufficiently different in ascospore morphology that it cannot be placed in Dingleya. The globose ascospores ornamented with hemispherical warts and glebal structure of L. phymatodeus do, however, agree well with the circumscription of Labyrinthomyces.
Labyrinthomyces turbinatus differs from L. tesselatus in having larger, pale brown, often turbinate ascomata, often with flattened polygonal warts, and in having ascospores ornamented with sparse, irregular, smaller warts (figs 10, 14-15). It differs from L. varius in having ascomata which are not tomentose, glebal fertile chambers remaining filled with paraphyses, asci and ascospores, paraphyses equalling the length of asci, and much thinner ascus walls.