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Page number:292 
Remarks (internal):Edibility and vernacular name. People from San Francisco Temezontla gather edible mushrooms in two forest types: the "ocotal" (Pinus forest) and the "encinal" (Quercus forest). All species of Russula in subsection Lactarioideae, including the new species where described are considered edible mushrooms by most of the inhabitants of this village. Basidiomes of these taxa are more abundant in the Pinus forest than in the Quercus forest. People apply the names "hongo blanco" (white mushroom) or "hongo blanco de ocote" (pine white mushroom) to all species of Russula subsection Lactarioideae whether they grow in the Quercus forest (e.g., R. delica var. centroamericana and R. herrerae) or in the Pinus forest (e.g., R. delica and R. romagnesiana Shaffer). 
Description type:Original description 
Description:Russula herrerae Kong, Montoya et Estrada, sp. nov.
Pileus 50-100 mm broad, convex-umbilicate to convex-depressed when young, soon plano-depressed and finally subinfundibuliform; margin not striate, acute, incurved to arched in section, with floccose to fibrillose appendiculate marginal veil; pellis separable 1/4-1/2 way to disc, dull, dry, radially rugulose, unpolished, radially fibrillose-rimose, often laciniate at margin, smooth or minutely velvety at disc, at times becoming areolate around disc or forming concentric fibrillose squamules on margin in dry weather; initially white, soon developing pale yellow (4A3), yellow (2.5Y 8-7/6, 5Y 8/6; 10YR 8-7/6), brownish yellow (10YR 6/6), greyish yellow (4B4), light yellowish brown (10YR 6/4), yellowish brown (5E5, 5F5, 10YR 5/8), dark yellowish brown (10YR4/6), very pale brown (10YR 8-7/4), light brown (5D5, 5D6, 7D5), brown (6D7, 6E6), greyish brown (6E3), light reddish brown (2.5YR 6/4, 5yR 6/4) or reddish brown (8D5, 8C6) tints in age; remnants of the marginal veil with very pale brown (10YR 7/4), light yellowish brown (10YR 6/4), yellowish brown (10YR 5/4), light brown (5D5, 6D5, 6D6), brown (6E6), dark brown (6F7) tints, squamules with brownish yellow (10YR 6/6), yellowish brown (10YR 5/6), dark yellowish brown (10YR 4/6, 3/6) tints. Trama 3-8 mm thick at midradius, hard; white, unchanging when cut, often yellow (10YR 7/8) brownish yellow (10YR 6/8), light brown (5D6), yellowish brown (5E6, 10YR 5/8) or brown (6D7) around larva channels or at stipe base; odor indistinct, aromatic or fruity, at times disagreeable or fishy in age; taste mild or slightly acrid. Lamellae adnate to decurrent, distant to subdistant (60 lamellae reaching the stipe: f = 8-11.1-15), not or infrequently forked near stipe, intervenose, anastomosing near stipe or near pileus margin, with numerous lamellulae [mostly one lamellula between two lamellae: (0-)1(-3)]; acute or subacute in front, 2-8 mm broad, slightly thick, brittle; milk white (1A2), whitish (Ib), cream (IIc) to pale yellow (2A3), without bluish green tints; edge even, concolorous; taste acrid. Basidiospore deposit whitish to pale cream (Ib-IIa). Stipe 10-45 mm long, 10-25 mm thick, equal or tapered downward; surface dull, dry, longitudinally rugulose, unpolished, pruinose at apex, at times with brownish remnants of the marginal veil as floccose or fibrillose cortina-like structure; white, developing grayish yellow (2B5), straw yellow (3B4), very pale brown (10YR 8-7/6, 7/4), brownish yellow (10YR 6/6), yellowish brown (10YR 5/8), light brown (6D6) yellowish brown (5F7) or dark brown (6F7) tints in age; solid becoming cavernous.
Basidiospores 7.2-8.2-10.5-12.1(-12.4) x 6.0-6.5-7.5-8.3 µm, ellipsoid to shortly ellipsoid, rarely subglobose [Q = (1.12-)1.16-1.24-1.42-1.59; V = 186-296 µm3; n = 153]; ornamentation partly to completely amyloid, up to 1.3 µm high, mostly 0.5-1.0 µm high, consisting of hemispherical, cylindrical or conical elements, with connecting lines of lower height, some elements fused in short ridges or subcatenulate, usually forming a partial to nearly complete reticulum; plage weakly amyloid. Basidia 50-64-80 x 9.5-11.4-13.5(-14.5) µm, clavate, four-sterigmate, hyaline in KOH; sterigmata 5-10 x 1.5-2.5 µm. Pleurocystidia 60-76-102-160(-175) x (7.5-)8.5-11.8-14.5 µm, usually clavate-fusoid or narrowly ventricose, with rounded or mucronate apices, at times with subapical constrictions, rather abundant (950-1500/mm2), projecting 5-50 µm beyond basidioles, rarely embedded in hymenium, completely filled with needle-like, yellowish contents in KOH, grayish brown to blackish brown in sulfovanillin (SV). Cheilocystidia 40-76-120 x 8.0-5.1-14.5 µm, similar to pleurocystidia, projecting 5-50 µm beyond marginal cells. Marginal cells 5.0-9.5 µm broad, cylindrical to clavate, more slender than basidioles, intermixed with basidia and cheilocystidia. Subhymenium composed of short hyphae, filamentous to pseudoparenchymatous. Lamellar trama heteromerous, consisting of nests of sphaerocytes, connective hyphae and abundant oleiferous hyphae; sphaerocytes 13-27-46(-48) µm broad, hyaline in KOH; connective hyphae 1.9-3.67-6.0(-6.4) µm broad, hyaline in KOH; oleiferous hyphae (3.1-)3.2-5.21-7.2 µm broad, with refractive contents in KOH. Pileipellis undifferentiated, without gelatinous matrix, 45-161-325 µm thick on disc; hyphae 2-9 µm broad, repent, interwoven, branched, thin- to slightly thick-walled (1.5 µm), some with encrusted pigment; extremities of the hyphae not aggregated, 3-9 µm in diam., filamentous, with rounded apices, often intermixed with inflated hyphae 6-20(-25) µm in diam. on margin; oleiferous hyphae 2.0-9.5 µm broad, scattered near trama; pileocystidia 30-76-135(-155) x (3.5-)4.0-5.1-6.5 µm, cylindrical to subfusoid, with rounded to mucronate apices or at times with subapical constrictions, thin-walled, not septate, partially filled with needle-like, yellowish contents in KOH, grayish brown, blackish brown to purplish brown in SV, scattered; without primordial hyphae; oleiferous hyphae often intermixed between pileipellis and trama, 2-9 µm broad, contorted irregularly, thin-walled, completely filled with homogeneous, refractive, yellowish contents in KOH, pink in SV, blue in cresyl blue, partially cyanophilous. Pileus trama heteromerous, consisting of nests of sphaerocytes, connective hyphae and oleiferous hyphae; sphaerocytes (21-)27-47-65 µm broad; connective and oleiferous hyphae similar to lamellar trama. Marginal veil composed of hyphal strands intermixed with inflated elements and sphaerocytes; cylindrical hyphae 4.0-11.0(-11.5) µm broad, some with yellowish, encrusted pigment; inflated elements 10-25 µm broad, thin- to slightly thick-walled (1.5 µm), regularly septate; sphaerocytes 40-60 µm broad, thin- to thick-walled (2.0 µm). Stipitipellis undifferentiated, without gelatinous matrix; hyphae 1.5-8.0(-9.0) µm broad, repent, interwoven, branched, thin- to slightly thick walled (1.5 µm), some with encrusted pigment; extremities of hyphae erect, with rounded, mucronate or rostrate apices, at times with subapical constrictions; caulocystidia 35-115-205(-220) x 3.5-6.1-9.5 µm, subcylindrical to fusoid, with rounded to mucronate apices, thin-walled, not septate, completely or partially filled with needle-like, yellowish contents in KOH, grayish brown, blackish brown to purplish brown in SV, rather abundant; oleiferous hyphae similar to those of the pileipellis. Velar remnants comprising hyphal strands and chains of sphaerocytes, similar to those of the marginal veil. Clamp connections absent from all tissues.
Macrochemical reactions (trama). -naphthol: grayish magenta (13-14E6), grayish violet (15-17E6) to dark violet (18F6); FeSO4: peach (7A4) to shell pink (8A3); guaiacol: brownish red (8C6), reddish brown (8D-E6), jasper red (9B7), photo brown (9F8), bluish red (12A6), grayish rose (12B6) or dusky red (0R 3/4); phenol: dark brown (8F8) or photo brown (9F8); sulfoformol: no reaction or pale orange (6A3).
TYPE. MEXICO, TLAXCALA: Municipality of Panotla, 1 km E of San Francisco Temezontla, 19°20'45'' N, 98°16'25'' W, 2550-2650 m alt., Quercus forest, 10-VIII-1993, A. Kong 2622 (HOLOTYPUS TLXM).
Etymology. Dedicated to Dr. Teófilo Herrera for his contributions to Mexican mycology.
Habitat and distribution. Solitary to scattered, in small groups of 2-4 basidiomes or subgregarious. On soil. In deciduous Quercus forest at 2550-2650 m above sea level. Jul to Oct. Presently known only from the type locality (19°20'45'' N, 98°16'25'' W).
Taxon name: