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Tubaria praestans

by Michael Kuo, 24 April 2023

Tubaria praestans is an apparently rare, poorly documented LBM (Little Brown Mushroom), originally described from France. Like other species of Tubaria it features a dull brown spore print and, under the microscope, spores that are pale brown and lack a pore. Within the genus it can be distinguished by its fairly large size (for a Tubaria), its silky-fibrillose cap, the presence of partial veil remnants on the cap and the stem, and, under the microscope, short and swollen cheilocystidia.

Naucoria praestans is a synonym.


Ecology: Saprobic; growing gregariously on the ground, often in disturbed-ground areas (ditches, paths, etc.); spring through fall; originally described from France (Romagnesi 1957); distributed in Europe and North America, with precise limits uncertain. The illustrated and described collection is from Michigan.

Cap: 1–3.5 cm across; convex at first, becoming broadly convex or nearly flat; dry; finely appressed-fibrillose; medium yellow-brown to orangish brown; the margin not lined; partial veil remnants often present.

Gills: Broadly attached to the stem; close; short-gills frequent; dull yellowish in buttons, becoming dull brown.

Stem: 2–4 cm long and 2–3 mm thick; more or less equal; very finely fibrillose; colored like the cap; basal mycelium white.

Flesh: Brownish; unchanging when sliced.

Odor: Not distinctive.

Chemical Reactions: KOH on cap surface dark reddish brown.

Spore Print: Brown.

Microscopic Features: Spores 8–10 x 4–5 µm; elongated-ellipsoid, with a tiny apiculus but without a pore; smooth; pale brown to dull yellowish in KOH; inamyloid; occasionally collapsing in both KOH and Melzer's mounts. Basidia 18–22 x 4–6 µm; clavate; 4-sterigmate. Cheilocystidia 15–25 x 10–15 µm; widely clavate to sphaeropedunculate; smooth; thin-walled; hyaline in KOH. Pleurocystidia not found. Pileipellis a cutis; elements 2.5–15 µm wide, smooth or encrusted, orangish brown in KOH. Clamp connections present.

REFERENCES: (H. C. L. Romagnesi, 1957) H. C. L. Romagnesi, 1957. (Kühner & Romagnesi, 1953; Moser, 1983; Migliozzi & Moreau, 2004; Antonin et al., 2012.) Herb. Kuo 09130802.

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Tubaria praestans

Tubaria praestans

Tubaria praestans

Tubaria praestans

Tubaria praestans

Tubaria praestans

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Kuo, M. (2023, April). Tubaria praestans. Retrieved from the MushroomExpert.Com Web site: