Clavulina griseoviolacea Yue Gao, Hao Zhou, & C. L. Hou 2024, sp. nov.
Creators: name: Gao, Yue
name: Tong, Xin
name: Zhou, Hao
name: Wang, Hai-Qi
name: Li, Cheng
name: Hou, Cheng-Lin
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Cantharellales
Hydnaceae
Clavulina
Clavulina griseoviolacea

description: Clavulina griseoviolacea Yue Gao, Hao Zhou, & C. L. Hou sp. nov.
Figs 2 D – E, 3 D, 5
Diagnosis.
Clavulina griseoviolacea differs from known Clavulina species in its gray to dark grayish violet basidiomata, with a white stipe, monopodial or irregularly polychotomous branches toward branch apices, basidiospores 6.5–8.0 × 6.2–7.2 μm, basidia 31.3–49.8 × 4.5–7.2 μm, postpartal septa present, and clamp connections present.
Etymology.
The epithet “ griseoviolacea ” refers to the basidiomata being gray to dark grayish violet.
Type.
China • Tianjin, Jizhou District, Jiulongshan; 40 ° 8 ' 51 " N, 117 ° 30 ' 36 " E, alt. 170 m; 21 Aug. 2022; H. Zhou, X. Y. Shen & X. B. Huang (BJTC ZH 0998); GenBank nrITS: PP 835334, nrLSU: PP 835347, rpb 2: PP 889520.
Description.
Basidiomata coralloid, solitary or scattered; individual basidiomata 25–45 mm tall, 12–20 mm wide across branches, basidiomata sparsely branched two to three times, monopodial or irregularly polychotomous toward branch apices and dichotomous at the base, branches subclavated to fattened and somewhat flattened with age, rough, with rounded tips; gray (# a 5 a 5 a 5) to dark grayish violet (# 9 b 92 a 6) when fresh and tips somewhat very dark brown (# 1 f 1605), dark brown (# 4 c 350 b) when dry. Stipes generally distinct, 10–20 mm long, 2–5 mm wide, subcylindrical or flattened, dark gray (# 777777) to dark grayish purple (# 7 a 747 f) and sometimes with a white base (# ffffff). Hymenium amphigenous, generally nodulosus and farinaceous.
Basidiospores [65 / 2 / 1] 6.5–8.0 (- 8.6) × (5.9 -) 6.2–7.2 (- 7.9) μm, Q = 1.00–1.23 (- 1.27), Q m = 1.12 ± 0.06, globose to subglobose, smooth, hyaline in H 2 O and KOH, thin-walled, inamyloid, with a 0.6–0.9 μm irregular hilar appendix, and one large oleiferous guttule. Basidia (29.3 –) 31.3–49.8 (- 65.3) × 4.5–7.2 (- 8.3) μm, clavate to subcylindrical, tapering from apex to base; postpartal septa present in most basidia, occurring 12–24 μm below basidia tips; two sterigmata occur per basidium, 3.8–6.7 μm long, and cornute. Basidioles abundant, subclavate to subcylindrical. Tramal hyphae in stipe smooth, with slightly thickened walls, hyaline in KOH, 2.6–5.5 μm wide, some tramal hyphae inflated; tramal hyphae in branch hyaline, thin-walled, 3.7–6.1 (- 8.9) μm wide; clamp connections abundant. Hyphal system monomitic. Cystidia absent.
Habit, habitat, and distribution.
Solitary or scattered humus layers on soils under Theropencedrymion, associated with Pinus L. Basidiomata generally occurring from July to August; currently known from Tianjin and Beijing, China.
Additional specimens examined.
China • Beijing, Mentougou District, Baihua Mountain; 39 ° 47 ' 50 " N, 115 ° 33 ' 35 " E, alt. 1,223 m; 16 Aug. 2023; H. Zhou, Y. Gao & X. Tong (BJTC ZH 1653).
Notes.
C. griseoviolacea is phylogenetically closely related to Clavulina cinerea, Clavulina iris var. occidentalis and Clavulina iris var. iris according to phylogenetic analyses (Fig. 1.), but Clavulina cinerea has lilac-gray to gray basidiomata, larger basidiospores (7–10 × 6–8 µm) and basidia (38–65 µm long up to 7 µm wide) (Burt 1922); Clavulina iris Loizides, Bellanger & P. - A. Moreau can be distinguished by its white-pruinose basidiomata, branches sometimes partially or extensively fused, larger basidiospores (9.2–10.4 × 6.5–8.5 µm) and basidia (45–80 × 6–9 µm), and 7–9 µm wide hyphal ends (pseudocystidia) (Crous et al. 2019). C. griseoviolacea is morphologically similar to Clavulina tuxtlasana M. Villegas, Garibay-Orijel & Pérez-Pazos in the color of basidiomata, but C. tuxtlasana basidiomata are simple, rarely branching dichotomously, branches with slight longitudinal wrinkles, smaller basidiospores (6–7.5 × 5.5–7 µm), and lacking clamp connections (Salas-Lizana et al. 2023). Clavulina crystallifera Meiras-Ottoni also has similar branching, but acerose crystals are present in the medullary hyphae of its branches (de Meiras-Ottoni and Gibertoni 2023).
description: Published as part of Gao, Yue, Tong, Xin, Zhou, Hao, Wang, Hai-Qi, Li, Cheng & Hou, Cheng-Lin, 2024, Three new species of the genus Clavulina (Hydnaceae, Cantharellales) from North China based on morphological and phylogenetic analysis, pp. 75-94 in MycoKeys 108 on pages 75-94, DOI: 10.3897/mycokeys.108.124004