Public Description of Chroogomphus filiformis Y.C. Li & Zhu L. Yang

Title: Public Description
Name: Chroogomphus filiformis Y.C. Li & Zhu L. Yang
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Description status: Unreviewed

General Description:

Chroogomphus filiformis is characterized by its primitively olive gray to orange gray or orange then pink to purplish pink pileus, yellowish then vivid pink mycelium on the base of the stipe, non-amyloid, somewhat viscid narrow hyphae in the pileipellis and slightly thick-walled cystidia. Chroogomphus helveticus has a pale orange yellow to somewhat rose-coloured pileus and a pinkish mycelium on the base of the stipe, which are similar to those of C. filiformis. However, C. helveticus has non-viscid, much broader hyphae (up to 15 μm in diam.) in the pileipellis and thin-walled cystidia.

Diagnostic Description:

Pileus 1–6 cm broad, subconical to appla- nate, sometimes slightly umbonate, margin always inrolled, dry, with radially arranged fibrillose to fine tomentose squamules, olive gray (3E2) to orange gray (5B3-5) when young and grayish orange (6B3-5) to orange (5A4-5) in age, but pink (11A3-4) to purplish pink (4A3-5) when dried. Lamellae decurrent, distant, orange yellow (5A4-5) when young, grayish orange (6B3-5) when mature, not forking; lamellulae common, attenuate, con- colourous with lamellae. Stipe 2–7 × 0.4–1 cm, subcylindric, sometimes slightly enlarged at base, orange yellow (5A4-5) then pink (11A3-4) in age, but golden yellow at apical part, and pink to pinkish at base, with pinkish remnants of annulus at the apical part; mycelium on the base of the stipe yellowish but vivid pink when dried. Trama of pileus and stipe orange yellow, without brown to dark brown tinge at the base of the stipe, unchanging in colour when bruised; taste and odor mild.

Basidia 30–55 × 10–15 μm, clavate, 4- spored, sometimes 2-spored, hyaline or with pink to pinkish vacuolar pigment in KOH, yellowish to yellowish brown in Melzer’s reagent. Basidiospores [300/10/6] (15.0)16.0– 19.0(21.5) × (5.5)6.0–7.0(7.5) μm, [Q = (2.36) 2.50–3.08(3.33), Qm = 2.77 ±0.17], subfusiform, thin- to slightly thick-walled (up to 0.7 μm in thickness), dextrinoid, yellowish, yellowish brown or pinkish brown in KOH. Lamellar trama made up of hyphae 4–14 μm in width, colourless to yellowish in KOH, with weakly scattered amyloid cell walls and cytoplasm. Pleuro- and cheilocystidia 90–170 × 14–21 μm, numerous, thin- to slightly thick-walled (up to 1.5 μm), subclavate with apical part attenuate or obtuse, with one to three constrictions at upper parts, hyaline or with pink to brownish pink vacuolar pigment in KOH, yellow to yellowish brown in Melzer’s, always with concolourous encrustations. Pileipellis compo-sed of more or less radially arranged to loosely interwoven, non-amyloid, somewhat viscid, colourless to yellowish, filamentous hyphae 4– 7 μm in diameter and often encrusted with yellow to yellowish brown pigment but soon dissolved in KOH solution; terminal cells 37– 100 × 4.5–7 μm, subcylindric. Pileal trama made up of hyphae 7–21 μm in diameter with weakly amyloid cell walls and cytoplasm, and encrusted with amyloid granules, colourless to yellowish in KOH but yellowish brown to pinkish brown beneath pileipellis. Mycelium on the base of the stipe composed of deeply amyloid hyphae 4–10 μm in diameter; clamp connections frequent.

Habitat: Solitary on the ground. Under Pinus armandii or in mixed forests dominated by P. armandii and P. yunnanensis.

Known distribution: Southwestern China.

Description author: Excited delirium [EXD]▼ (Request Authorship Credit)