Name: Lactarius sanjappae
Author: K. Das, J.R. Sharma & Montoya
Pileus 30-50 mm diam., plane, soon becoming deeply depressed to funnel shaped, typically without an umbo or papilla; pileipellis mat, dry, azonate, radially rugose-wrinkled to venose, often pitted; veins distinct forming a broken reticulum; pale reddish-brown to pale brown, paler towards margin, veins darker, deep to dark brown; margin incurved, wavy. Lamellae subdecurrent, close (ca. 6 per cm at margin), pale orange-yellow to light brown, lamellulae of different sizes. Stipe 40-110 × 5-7 mm, cylindric, concolorous, rather darker towards base. Context solid to stuffed but not hollow, medium orangish-yellow to light brown. Latex copious, watery to milky white, unchanging. Odor mild. Spore print not obtained. Basidiospores 7.5-8.8 × 6.2-7.6 μm, (Q = 1.15-1.23) broadly ellipsoid; ornamentation amyloid, 0.8-1.2 (-1.8) μm high, a partial to a complete reticulum with isolated ridges and warts, plage not distinct; under SEM reticulum is composed of continuous bands, with irregular margin, with some free extremes. Basidia 28-40 × 5-10 μm, subclavate to clavate, 4-spored; sterigma up to 6.5 μm long. Pleuromacrocystidia 48-74 × 7-10 μm, fusiform to oblanceolate, acute to rostrate, emerging 12-20 μm; contents refractive. Pleuropseudocystidia cylindric to subclavate, rounded at apex, up to 6 μm broad, numerous. Lamellar edges composed of basidia and cystidia. Cheilomacrocystidia 30-50 × 6-8 μm, lanceolate to narrowly fusiform. Hymenophoral trama cellular, with sphaerocytes and hyphae, laticifers up to 12 μm broad. Pileipellis a hyphoepithelium; subpellis a stratum up to 58 μm thick, composed of irregularly shaped, subisodiametric cells, frequently arranged in 3-6 layers, elements 15-35 × 10-20 μm; suprapellis of anticlinal, scattered, septate elements, frequently arranged in tufts (even in mature specimens), terminal cells 14-25 × 4-5 μm, thin walled.
Ecology: Lactarius sanjappae is found under Quercus leucotrichophora in subtropical to temperate deciduous forests of Uttaranchal. Lactarius verbekenae (see below) was also found at the type locality of the present species.
Notes: Morphologically, Lactarius sanjappae is characterized by the distinctly radially rugose-wrinkled pileus surface and the slender habit of its basidiomes. The pileipellis is composed of a hyphoepithelium and trichodermial tufts. This latter character is unique to this taxon among the known species of the sections Tabidi (Heilmann-Clausen et al., 1998) and Rhysocybella Bon (Basso, 1999).
Created: 2016-04-07 21:24:15 PDT (-0700) by Danny Newman (myxomop)
Last modified: 2018-12-27 22:25:59 PST (-0800) by Image Sharer (image sharer)
Viewed: 7 times, last viewed: 2019-07-09 14:45:30 PDT (-0700)