Name: Boletus subluridellus A.H. Sm. & Thiers
Most Confident Observations:
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Copyright © 2011 Dan Molter (shroomydan)
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Copyright © 2019 dario.z (dario13)
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First person to use this name on MO: walt sturgeon
Editors: Eddee

Nomenclature:

Rank: Species

Status: Accepted

Name: Boletus subluridellus

ICN Identifier: missing

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Author: A.H. Sm. & Thiers

Citation: Boletes of Michigan (Ann Arbor): 349 (1971)

Classification:

Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Boletales

Family: Boletaceae

Genus: Boletus

Lifeform:
Brief Description: [See More | Edit]

Cap: 4-13 cm across; convex, becoming broadly convex; dry; finely velvety when young, with a resinous feel; sometimes becoming more or less bald by maturity; brownish red to orangish red, with a thin layer of brownish to olive brown fuzz that can be rubbed away; sometimes with mottled yellow and red shades; when fresh bruising deep violet, then slowly blackish; margin at first inrolled and yellowish, with a narrow sterile overhang.

Pore Surface: Initially dark orangish red; fading to orange; bruising promptly dark blue or nearly black; 3-4 round pores per mm; tubes to 1 cm deep.

Stem: 4-10 cm long; 1-1.5 cm thick; more or less equal; often curved near the base; not reticulate; yellow, coated with red, especially toward the base; bruising blue; basal mycelium whitish to yellow, bruising dark red.

Flesh: Yellow in the cap; darker yellow in the stem; promptly bluing when sliced.

Odor and Taste: Not distinctive. Some people can detect a distinctive almond odor.

Chemical Reactions: Ammonia negative on cap surface; orangish on flesh. KOH orange to red on cap surface; orange on flesh. Iron salts negative on cap surface; negative on flesh.

Spore Print: Olive.

Microscopic Features: Spores 9-15 × 3.5-4.5 µ; smooth; fusiform; yellow in KOH. Hymenial cystidia inconspicuous; yellow in KOH; widely fusiform; to about 50 µ long. Pileipellis a tightly packed trichoderm of hyphae 2.5-5 µ wide; yellowish to yellow in KOH; terminal elements cylindric with rounded apices, or aciculate, with subacute apices. Some pileipellis and subcuticular elements pinkish red in Melzer’s reagent. Caulocystidia of two types: fusoid-ventricose, yellow in KOH, 25-25 µ long; or fusiform to fusoid-ventricose with an extended mucro, to 100+ µ long.

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Photo of Smith’s holotype
By: I. G. Safonov (IGSafonov)
2019-07-18 21:48:22 PDT (-0700)

Catalog #: 10055
Taxon: Boletus subluridellus A.H. Sm. & Thiers
Family: Boletaceae
Determiner: A. H. Smith
Type Status: Holotype
Collector: A. H. Smith 64046
Date: 1961-09-03
Locality: USA, Michigan, Washtenaw, Ypsilanti Golf Course, Ypsilanti
Habitat: In grassy oak woods
Occurrence Remarks: Boletes Mich. 1971 pg. 349.

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