The veiled species of Hebeloma in the western United States / Alexander H. Smith, Vera Stucky Evenson, and Duane H. Mitchel.

24 The Veiled Species of Hebeloma
hyphae typically 1.2-3 Jm diam and usually with clamp connections.
Lamellar trama of ~ parallel hyphae narrower near the subhymenium
than in the central core; subhymenium of narrow filamentous hyphae,
rarely containing some small but inflated cells.
Habit, habitat and distribution.-Solitary to gregarious to caespitose on soil in conifer or hardwood forests, on sand dunes, disturbed
soil, or on stream banks or outwash areas along streams, spring, summer, and fall; in the Rocky Mountains typically abundant during July
and August; in the Pacific Northwest late summer and fall. Most
species, apparently, are mycorrhiza formers with forest trees and
shrubs, and they occur at all elevations to above the timber line. The
genus is present throughout the entire western United States.