Public Description of Boletus subluridellus A.H. Sm. & Thiers

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Name: Boletus subluridellus A.H. Sm. & Thiers
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Description status: Unreviewed

Taxonomic Classification:

Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Boletales
Family: Boletaceae


General Description:

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.


Diagnostic Description:

This red-pored, oak-loving bolete features a deep red to brownish red cap that is initially covered with a thin layer of brownish fuzz. At first, the cap surface has a resinous feel to it—but by maturity it feels soft and leathery. When fresh the cap bruises dark violet, rather than blue—and the stem is yellow underneath a healthy coating of red. Microscopic features, which should be confirmed for positive identification, include elongated caulocystidia and pileipellis elements that turn red in Melzer’s reagent. An odor reminiscent of almonds is a distinctive feature for some, but others report no odor from the same specimens.


Distribution:
widely distributed east of the Great Plains

Habitat:

Mycorrhizal with oaks; growing alone, scattered, or gregariously


References:

http://www.speciesfungorum.org/...

Kuo, M. (2013, December). Boletus subluridellus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/boletus_subluridellus.html


Notes:

Current Name:
Boletus subluridellus A.H. Sm. & Thiers, Boletes of Michigan (Ann Arbor): 349 (1971)


Description author: walt sturgeon (Request Authorship Credit)
Description editor: Charlotte Caplan


Created: 2013-12-26 22:47:22 CST (-0500) by walt sturgeon (Mycowalt)
Last modified: 2014-10-06 18:48:30 CDT (-0400) by Charlotte Caplan (Ccaplan)
Viewed: 18 times, last viewed: 2018-08-10 19:28:55 CDT (-0400)