Name: Austroboletus gracilis
Author: (Peck) Wolfe
Citation: Bibliotheca Mycologica 69: 69 (1980) [MB#118431]
Synonym(s):Austroboletus gracilis var. gracilis
Deprecated Synonyms: Tylopilus gracilis (Peck) Henn.
Misspellings: Austroboletus gracillis
Cap: 3-10 cm; convex to broadly convex in age; dry; smooth or felty; sometimes becoming cracked; margin even; reddish brown to cinnamon to dull yellow brown.
Pore Surface: Whitish becoming pinkish to flesh-colored to pinkish brown; bruising brownish; pores circular, 1-2 per mm; tubes to 2 cm deep.
Stem: 7-18 cm long; .5-1 cm thick; gracefully narrowing to apex, or more or less equal; colored like the cap or paler; sometimes slightly curved; frequently longitudinally grooved and/or vaguely reticulate; white at the base.
Flesh: White or pinkish; unchanging when sliced.
Odor and Taste: Taste mild to slightly acidic; odor not distinctive.
Chemical Reactions: Cap surface dark red to orange with ammonia, dark brown with KOH; flesh negative with KOH or ammonia.
Spore Print: Rosy brown.
Microscopic Features: Spores 10-17 × 5-8 µ; minutely pitted (use oil immersion lens); roughly elliptical.