棕色小蘑菇Micropsalliota arginophaea

描述1 描述来源：中国小蘑菇属三新记录种
类型：完整全面的描述（摘录自专著、论文等）
描述原文：
（1）棕色小蘑菇Micropsalliota arginophaea Heinem.，Bull. Jard. Bot. Nat. Belg. 50：51.1980.
宏观特征：菌盖直径 6~20 mm， 半球形、近凸形至平展， 中间常凸起， 密被浅褐色至红褐色纤维鳞片状绒毛菌肉 0.5~0.8 mm厚， 白色；菌褶离生， 密， 1~1.5 mm宽， 棕灰色至棕褐色；菌柄长7~40 mm，直径0.5~2 mm，圆柱形，菌环以上光滑， 菌环以下被绒毛， 白色至淡黄色；菌环中上位，膜质，单层，0.5~2 mm宽，白色。
显微特征：孢 子（3.8~4.7） μm×（2.6~3.2） μm， [x=（4.3±0.21） μm×（2.8±0.15） μm， Q=1.38~1.68； Q m =1.53±0.09， n=30]， 椭圆 形 ， 棕褐 色； 担子（9.5~11） μm×（3.6~4.2） μm，棒状，2~4孢子；担子梗长1.2~2.1 μm；褶缘囊状体（30~39.3） μm×（6~8） μm，顶端宽3.8~6.5 μm，近圆柱形至棒状，透明，光滑；菌盖皮层由直径3~8 μm的菌丝组成，圆柱形、近纺锤形至近棒状，棕褐色，菌丝细胞在隔膜处稍缢缩，有色素，末端细胞（34.2~47.9） μm×（8~12.9） μm；菌柄皮层菌丝与菌盖皮层菌丝相似。 生境：群生于红壤林地。分布：马来西亚（模式产地）、泰国。

描述2 描述来源：A monograph of Micropsalliota in Northern Thailand based on morphological and molecular data
类型：原白（原始描述）
描述原文：
5. Micropsalliota arginophaea Heinem., Bull. Jard. Bot.Nat. Belg. 50:51. 1980. Fig. 9 ; Plate 1f.
Pileus 6–20 mm diam., hemispherical to convex or campanulate, expanding to plano-convex, often subumbonate to umbonate; surface fibrillose-squamulose, dense-ly so on the disc, sometimes glabrescent, brown over all when young. Context 0.5–0.8 mm thick, white. Lamellae free, crowded, with 3 series of lamellulae, 1–1.5 mm broad, straight to slightly ventricose, light brown to brownish-gray (7C2) or brown (7E4), edges paler. Stipe size variable, 7–40×0.5–2 mm, cylindrical, slender orstout, smooth above annulus, fibrillose to floccose below the annulus, white. Annulus persistent, pendent, single, rigid, superior, membranous, 0.5–2mmbroad,white.Odor not distinctive. No color staining when bruised orcut. Macrochemicial reaction: KOH reaction reddish brown.Spores 4  5:5  2:5  3 m m½x ¼ 4:8  0:5  2:80:3mmQ ¼ 1:3  2; Qm¼ 1:74  0:44; n ¼ 20, ellipsoid to amygdaliform, no germ pore, brown. Basidia 9–12×4–5 μm, clavate, 4-spored. Cheilocystidia 17–30 (−42)×4–8 μm, apex 3.5–6 μm diam., shape variable, subcylindrical to clavate, mostly with long elongated neck, somesubcapitate with swollen base, some with a spear-like apex, hyaline, smooth. Pleurocystidia absent. Pileipellis a cutis composed of hyphae 3–8(−12) μm diam., cylindrical, lightbrown or brown, sometimes slightly constricted at septa, with membranous and incrusting pigments. Annulus hyphae5–8 μm diam., hyaline, smooth. Habit: 2–4 basidiomes cespitose, clusters gregarious inred soil.
Known distribution: Malaysia (type locality); Thailand.Mate rial examined: THAILAND, Chiang Mai Prov.,Chom Thong, Ob Luang National Park, elev. 1,812 m, 23June 200 5, collected by Than h Huyen Le, ZRL2027(BBH#19414; SFSU); Chiang Mai Prov., Mae Taeng, BanMae Sae Village, on Highway 1095 near 50 km marker, N19°14. 599′ E98°39.456′, elev. 962 m, 3 July 2005, collected byThitiya Boonpratuang, ZRL2088 (BBH#19471; SFSU) andZRL2091 (BBH#19474; SFSU); same location, 3 July 2005,collected by Amy Honan, ZRL2089 (BBH#19472; SFSU);same location, 18 August 2005, collected by Ruilin ZhaoZRL2130 (BBH#19510; SFSU); Chiang Mai Prov., MaeTaeng Dist., Ban Pha Deng Village, N 19°17.123′ E98°44.009′, elev. 900 m, 2 September 2006, collected by ThanhHuyen Le, ZRL3097 (BBH#19613; SFSU); same location, 20September 2006, collected by Ruilin Zhao, ZRL3106(BBH#19622; SFSU); same location, 10 October 2006,collected by Ruilin Zhao, ZRL31 10 (BBH#19626; SFSU).
Notes: Micropsalliota arginophaea is distinguished by abrown fibrillose-squam ulose pileus, small spores, no stain-ing reaction when bruised or cut, but a strong reddishbrown reaction with KOH. Although the basidiome featuresand cheilocystidia shape are quite variable in this speci es,the ITS data indicate that this variability can be accepted asinfraspecific one. The LSU data suggest that specimensZRL 3097 and ZRL 3110 fall outside of the cladecontaining other specimens of M. arginophaea, but withoutstatistical support. Micropsalliota arginophaea is similar inpileus coloration and ornamentation and spore size to M.brunneolaHeinem. and M. brunneosperma (Singer) Pegler.Micropsalliota brunneola differs, however, in forming alarger, more strongly squamose pileus (20–30 mm diam.with erect or recurved squamules up to 1 mm high), andbroader pileipellis hyphae (8–20 μm diam.). Unf ortunately,there are no published data on cheilocystidia morphology for M. brunneola (Heinemann 1980). Micropsalliota brunneosperma differs in having broader spores (3.2–4.5 μm diam.), and consistently capitate cheilocystidia witha long and narrow neck (Pegler 1977).