Tuber macrosporum

Tuber macrosporum Vittad. Monographia Tuberacearum p.35, pl.1 fig.5 (1831).

Ascocarp Morphology. Ascocarp subglobose or globose or lobed, orifice or cavity absent, 1-4(-7) cm in diameter, black (blackish) or gray or brown (reddish-brown) or red (reddish-brown), smooth or with warts, warts flat, peridium scabrous, color of spore-bearing tissue grey (greyish-brown) or brown (greyish-brown), veins narrow and numerous. Peridium 200-300 micron, outermost layers 80-100 micron, red-brown or brown, anatomical structure plectenchymatic, innermost layers 120-200 micron, color yellow-brown (giallognolo), anatomical structure plectenchymatic, external cystidia absent.

Asci ans spores Morphology. Asci globose, major axis 95-140 micron, minor axis 65-95 micron, number of spores per ascus 1-3, irregularly clustered.

Spores ellipsoid, major axis 40-75 micrometer lenght, minor axis 30-50 micrometer lenght, color dark brown, reticulation; ornamentation length 3-4 micron; number of meshes along the major axis 7-9.

Distribution. Habitat temperate; Putative plant host Quercus, or Populus, or Salix, or Castanea.

Mycorrhizae morphology. Mycorrhizae emanting hyphae absent, or rare; anatomy of emanating hyphae: clamps absent; color of emanating hyphae hyaline; color of very tip whitish, or ochre, yellowish brown; color of older parts ochre, yellowish brown, or brown; cystidia absent, or present; needle like; color pale yellow, or ochre; intercalate swelling present; ramification present; abundant; dichotomous; medial, or distal; anatomy of the mantle pseudoparenchymatus with epidermoid hyphal cells" like a puzzle".


Images:
Tuber macrosporum.jpg
Tuber macrosporum ascocarp.jpg
Tuber macrosporum spores.jpg
Tuber macrosporum cistidi.jpg
Tuber macrosporum micorriza.jpg

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