Boletus mottiae Thiers
No common name
Boletaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
No common name
Boletaceae
Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.
Introduction to the Macrofungi
Photograph
Species Information
Summary:
It is possible that at least the holotype of the species is a variation of Boletus regineus. The outstanding character is the strongly reticulated or ridged cap surface, other features include a moist to subviscid brown cap, white unchanging flesh, angular white pores that become yellow to greenish yellow but do not change when bruised, buff to pinkish buff stem that is finely reticulate over entire surface, and microscopic characters. According to D. Miller (pers. comm.) this may be Boletus regineus and not a separate species.
Chemical Reactions:
cap surface and flesh do not stain with the application of KOH or FeSO4
Odor:
not distinctive (Thiers)
Taste:
not distinctive (Thiers)
Microscopic:
spores 14.3-17.1 x 3.8-5.2 microns, cylindric to subelliptic [somewhat elliptic] in face view, ventricose and inequilateral in side view, smooth, pale ochraceous in KOH, slightly darker in Melzer''s reagent, thin-walled; basidia 2-spored and 4-spored, 23-30 x 7-10 microns, clavate, colorless in KOH; hymenial cystidia not seen when specimen revived in KOH; cap cuticle "subgelatinous, up to 500 microns broad, well differentiated as a somewhat tangled to suberect trichodermium, hyaline in KOH, not staining in Melzer''s, terminal hyphae septate with terminal cells ovoid to clavate, 20-40 x 10-20 microns, subterminal cells more elongate to ellipsoid, walls sometimes incrusted, cross walls inamyloid, hyphae 3-7 microns wide"; stem cuticle "a layer of fertile basidia with scattered, fusoid to clavate to fusoid-ventricose caulocystidia"; clamp connections not seen, (Thiers)
Spore Deposit:
unknown
Notes:
Boletus mottiae was described by Thiers as Boletus mottii, but since the person after whom it was named was a woman, "mottiae" is correct. The species was described from CA. It has been reported from WA (J. Lindgren, pers. comm., M. Beug, pers. comm.) and there is a collection by J. Ammirati at the University of Washington. There is a collection from BC at the Pacific Forestry Centre. It has also been reported from OR (H. Thiers 1986 pers. comm. to L. Norvell), and appears on an Idaho foray list.
EDIBILITY
unknown (Thiers)
Habitat and Range
SIMILAR SPECIES
Boletus mottiae is distinguished from members of Boletus edulis complex by the strongly reticulated or ridged surface of the cap of B. mottiae. When compared with B. edulis, cap color is different, and reticulum on stem is of B. mottiae is much more delicate, (Thiers). Boletus fibrillosus (cap surface remotely suggestive of that of B. mottiae) has yellow tubes when young, a rather elongated stem, and a much darker colored cap, (Thiers).Habitat
type was found under conifers (Thiers), fall
Status Information
Synonyms
Synonyms and Alternate Names:
Dentinum repandum (L.) Gray