Suillus foetidus Y. Li & L.L. Qi, 2016

Qi, Liangliang, Fu, Yongping, Wang, Fengjian, Song, Bing & Li, Yu, 2016, Suillus foetidus (Boletales, Basidiomycota), a new species from northeast China, Phytotaxa 260 (2), pp. 167-175 : 171-172

Suillus foetidus Y. Li & L.L. Qi , sp. nov. (FIGUER 1, 2 & 3), Fungal Names FN570233

Diagnosis:— Suillus foetidus differs from Suillus bovinus by concolor pileus, changed to greenish blue hymenphore when cut and presence of clamp connections.

Etymology:— The species epithet “ foetidus ” refers to the smell of this species when being dried.

Type:— CHINA. Heilongjiang Province: Mudanjiang City, Mudan Mt., 476masl, 15 September 2014 ( HMJAG 34337, Holotype!).

Pileus 20–90(–150) mm broad, plano-convex to nearly plane, becoming depressed with age, dry or viscid (in wet weather or after rain); margin incurved at first becomes wavy and finally nearly plane with age, brown (4, 5 B 4, 5) when young, grayish brown (5, 6 C 4) and darkish brown (6 C 4) in center with age. Flesh white to pinkish brown or reddish brown (6 C 7), middle part slowly staining greenish blue or dark blue when cut but disappearing very soon (after 5 min). Hymenophore decurrent, tubular to poroid-lamellate, anastomosing, tubes 3–6mm long, pores 3–6mm broad, angular to quadrilateral, compound, sub-lamellate at the stipe, yellowish brown (4 C 6) to rust brown (6D7), black brown (7 F 7, 8) with age, slowly staining greenish blue when cut. Stipe 50–80mm long, 10–15mm thick, dry, almost equal when young, obclavate with age or gradually swollen towards base, rust brown at apex, finely same with the pores, and otherwise blackish brown, solid. Stipe surface reddish or blackish brown then bruised, smooth. Context soft, brownish to pale brown, when exposed partly changed to reddish brown (9D5). Veil or annulus absent. Spore print grey brown to dark red brown. Odor very unpleasant when old or dry; taste mild or lightly bitter.

Basidiospores ( Fig. 2a ; Fig. 3 a&b ) 9.0–11.6(–13)×(4–)4.2–5.0μm, n=20, x=10.3×4.6μm, Q =2.23, ellipsoid, subfusoid to fusoid, honey yellow to pale brown in deposit, light brown in 3% KOH, smooth, thin-walled, nonamyloid. Basidia ( Fig. 2c ; Fig. 3 c&d )(27.8–) 29.0–38.7(–49)×6.4–7.3(–8)μm, clavate, 4-sterigmata, hyaline or brownish yellow contents in fresh deposit or KOH, and coagulated dextrinoid in Melzer’s. Hymenial cystidia(27.8–) 29.1–38.8(–40.5)×(6–)6.4–7.3(–8)μm, scattered, cylindrical or clavate and very similar to basidia, smooth, thin-walled, golden to pale brown scattered oleiferous vacuole, inamyloid. Hymenophoral trama parallel hyaline to pale brown, parallel, elements 5–8μm wide, subgelatinous with age. Pilerpellis a trichoderm, with interweaved hyphae, cylindrical,

smooth, with encrusted pigment, pale yellow to yellowish brown contents in KOH, orange brown in dH 2 O, inamyloid in Melzer’s, thin-walled, 5.5–8.0μm wide. Pileus trama, interwoven, pale brown, inamyloid, thin-walled. Stipitipellis hyphae parallel, brown or yellow brown to rust, with encrusting pigment in dH 2 O (but dissolving in KOH), inamyloid, rarely with scattered caulocystidia. Stipe trama hyphae parallel to subparallel, hyaline to pale yellow, cylindrical,

inamyloid. Clamp connections present.

Habit, habitat and distribution: — Solitary to scattered in soil of coniferous forest under Larix olgensis or L.

gmelinii; currently only known from northeast of China.

Additional specimens examined: — CHINA. Heilongjiang Province: Mudan feng national natural reserve,

476masl, 44°26′N, 129°48′E, 25 July 2011, Fei Ma 0630 ( HMJAU34339 !) ; same location, 26 July 2011, Fei Ma 0648

( HMJAU 34338!). Dongning County, 490m asl, 44°14′N, 131°07′E, 1 August 2015, Liangliang Qi & MengleXie 3984

( HMJAU 34336!); Mudangjiang City , Weihu Mountain, 404m asl, 44°43′N, 129°11′E, 4 August 2015, Liangliang Qi

& MengleXie 4191 ( HMJAU34335 !) ; Mohe County, 477m asl, 53°08′N, 122°19′E, 27 August 2015, Liangliang Qi

&MengleXie 5083 ( HMJAU 34334!). HMJAU 34337, HMJAU 34339, HMJAU 34338, HMJAU 34336, HMJAG 34335

were collected in L. olgensis forest and HMJAG 34334 was collected in L. gmelinii forest.

Figures

FIGURE 2. Microscopic features of Suillus foetidus (voucher specimen HMJAU34337). a. Basidiospores. b. Stipitipellis hyphae (bold: showed apex hyphae with encrusting pigment) c. Basidia. d. Pileipellis hyphae. Scale bar: a–d=10 μm.

FIGURE 3. Microscopic features of Suillus foetidus under SEM (voucher specimen HMJAU34337). a&b: Basidiospores. c&d: Basidia.