Hygrocybe rimosa C.Q. Wang & T.H. Li, sp. nov. (Figs. 3–4)Fungal Names: FN570860
Diagnosis:—Hygrocybe rimosa is characterized by its yellow to reddish pileus with a paler margin, striated pileuswith radial fibrils, broad to ventricose lamellae, subglobose to oblong basidiospores measuring (7)7.5–11 × 5–8(8.5)μm. Hygrocybe rimosa differs from H. intermedia in having a smaller pileus, white lamellae, a slenderer stipe, broaderbasidiospores, and the distribution in southern China.
Etymology:—rimosa (lat.) means cracks or fissures, refers to the cracked pileus surface.
Typification:—Guizhou Province: Duyun City, Doupengshan, 26°22’N, 107°22’E, elev. ca. 1200 m, 10 September2019, Ming Zhang, Wangqiu Deng and Ting Li (GDGM78405, Holotype).
Gene sequence ex-holotype: MZ825202 (ITS), MZ848472 (LSU).
Description:—Pileus 1.4–4.5 cm, conic with a flat disc when young, becoming convex, plane to depressed whenmature, waxy, light yellow to orange-yellow (4A5–7), orange to deep orange (5A6–8), red or vivid red (9A7–8), darkerat center, paler and often more or less lemon yellow (3B5–8) towards the margin, usually with streaky radial fibersfrom about half the radius, tending to split or rimose radially from margin towards disc; margin slightly decurved torevolute and sometimes lacerated when young, gradually extended, arched to uplifted when mature. Context thin,white, unchanging when injured, brittle. Lamellae free, ventricose, up to 0.6 cm broad, subdistant, white, marginsconcolorous with faces, waxy, thick, fragile, with 1–3 unequal lamellulae between two entire lamellae, eroded at edge.Stipe 2–7 cm long, 0.2–0.6 cm thick, central to slightly eccentric, cylindrical, usually slightly enlarged downwards,white, pale yellow to yellow (3A3–6) when mature, usually white or paler at apex, with inconspicuous longitudinalstripes, waxy, hollow. taste mild. Odor indistinctive.
Basidiospores (7)7.5–11 × 5–8(8.5) μm, Lm = 9.13 ± 0.93, Wm = 6.66 ± 0.88, Q = (1.13)1.15–1.58(1.73),Qm = 1.38 ± 0.13, subglobose, broadly ellipsoid, ellipsoid to oblong, hyaline, smooth, thin-walled. Basidia 4-spored,(34.5)35–52 × 9.5–13.5 μm, Q = (2.77)3.08–4.52(4.73), Qm = 3.76 ± 0.46, broadly clavate; sterigmata mostly 5–7μm long. Lamellar trama regular, composed of long, parallel, hyaline, thin-walled, septate hyphae 4–40 μm in width.Pileipellis a cutis, consisting of hyphae 5.5–14.5 μm broad. Stipitipellis a cutis, made up of repent hyphae 3.5–12 μmbroad. Clamp connections present in all tissues.
Known distribution:—Occurring in the subtropical regions in China, only known from Guangdong and Guizhouprovinces until now.
Habit and habitat:—Scattered to gregarious in semi-natural grasslands or abandoned fields, occurring from Mayto September.
Additional specimens examined:—CHINA. Guangdong Province: Fengkai County, Heishiding, 23°25’N,111°53’E, elev. ca. 450 m, 17 May 2013, Hao Huang (GDGM40048, GenBank accession numbers: MZ825203 forITS, MZ848469 for LSU); Guizhou Province: Duyun City, Doupengshan, 26°22’N, 107°22’E, elev. ca. 1200 m, 10September 2019, Ming Zhang, Wang-Qiu Deng and Ting Li (GDGM78767, GenBank accession numbers: MZ825204for ITS, MZ848470 for LSU); Huishui County, Baijin Town, Dahua Village, 26°12’N, 106°77’E, elev. ca. 1050 m, 3July 2021, De-Jun Luo HS20210701 (GDGM85785, GenBank accession numbers: MZ825200 for ITS, MZ848473 forLSU).
参考翻译：
裂盖湿伞 Hygrocybe rimosa C.Q. Wang & T.H. Li, 新种 (图 3–4)
Fungal Names: FN570860
特征综述： 裂盖湿伞的特征在于其黄色至淡红色的菌盖和颜色较浅的菌盖边缘、具条纹和放射状菌丝的菌盖、宽至腹鼓状的菌褶，以及亚球形至矩圆形的担孢子，大小为 (7)7.5–11 × 5–8(8.5) μm。裂盖湿伞与 H. intermedia 的区别在于其菌盖较小、菌褶白色、菌柄更纤细、担孢子更宽，以及分布在中国南部。
词源： rimosa（拉丁语）意为裂缝或裂隙，指菌盖表面的开裂现象。
模式指定：Guizhou Province: Duyun City, Doupengshan, 26°22’N, 107°22’E, 海拔约1200 m, 2019.9.10, Ming Zhang, Wangqiu Deng and Ting Li (GDGM78405, 主模式). 序列信息: MZ825202 (ITS), MZ848472 (LSU).
形态描述：菌盖 直径1.4–4.5厘米，幼时圆锥形，中部平，成熟后变为凸镜形、平展至中凹；蜡质；浅黄色至橙黄色(4A5–7)，橙色至深橙色(5A6–8)，红色或鲜红色(9A7–8)，中部颜色较深，向边缘颜色变浅且常带些许柠檬黄色(3B5–8)；从约半径一半处开始通常具有条状放射纤维，并倾向于从边缘向菌盖中部呈放射状开裂或形成裂缝；菌盖边缘幼时微下弯至反卷，有时撕裂状，成熟后逐渐伸展、呈拱形至上翘。菌肉 薄，白色，受伤后不变色，脆。菌褶 离生，腹鼓状，宽达0.6厘米，近稀疏，白色，边缘与菌褶面同色，蜡质，厚，脆，在两片菌褶间有1–3片不等长的小菌褶，边缘呈蚀刻状。菌柄 长2–7厘米，粗0.2–0.6厘米，中生至稍偏生，圆柱形，通常向下稍增粗，白色，成熟时浅黄色至黄色(3A3–6)，顶端通常白色或较浅，具不明显的纵条纹，蜡质，中空。味道 温和。气味 不显著。
担孢子 (7)7.5–11 × 5–8(8.5) μm，平均长度Lm = 9.13 ± 0.93，平均宽度Wm = 6.66 ± 0.88，Q值（长宽比） = (1.13)1.15–1.58(1.73)，平均Qm = 1.38 ± 0.13，亚球形、宽椭圆形、椭圆形至矩圆形，透明，光滑，薄壁。担子 4孢子梗，(34.5)35–52 × 9.5–13.5 μm，Q = (2.77)3.08–4.52(4.73)，平均Qm = 3.76 ± 0.46，宽棒状；小梗大多长5–7 μm。菌髓 规则型，由长、平行、透明、薄壁、具隔膜的菌丝组成，宽4–40 μm。菌盖皮 表皮型，由宽5.5–14.5 μm的菌丝组成。菌柄皮 为表皮型，由匍匐菌丝组成，宽3.5–12 μm。锁状联合 在所有组织中存在。
已知分布： 出现于中国亚热带地区，目前仅知分布于广东和贵州省。
习性与生境： 在半天然草地或废弃田地中散生至群生，出现于5月至9月。
