Collybiopsis indocta R. H. Petersen, Mycotaxon 2021
Creators: name: Kumla, Wiphawanee Phonrob Jaturong
name: Suwannarach, Nakarin
name: Khuna, Surapong
name: Nutaratat, Pumin
name: Wannathes, Nopparat
name: Lumyong, Saisamorn
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Marasmiaceae
Collybiopsis
Collybiopsis indocta

description: Collybiopsis indocta (Corner) R.H. Petersen, Mycotaxon 136(2): 342 (2021) FIGURE 5
Index Fungorum number: IF556188
Pileus 13–40 mm diam., plano-convex to concave-infundibuliform, subumbilicate, striate, glabrous, margin translucent-striate, orange white to grayish orange (5–6A–B2–5) at center becoming creamy or orange white to white (5A1–2) at margin, hygrophanous turning creamy orange with moisture loss. Context thin (1 mm), white. Lamellar adnate, close to subdistant (20–28) with 2–4 series of lamellulae, white, narrow (2–3 mm). Stipe 29–67 × 2–4(8) mm, central, tap compressed, hollow to fistulose, squamulose at apex, fibrillose at base, orange white to grayish orange (5–6A–B2–5), the apex yellowish white (4A2), basal tomentum of matted hyphae.
Basidiospore [75/3/3] (6.5)7–9(9.5) × 3–5(5.5) µm [x̄ = 8.4 ± 0.63 × 3.68 ± 0.48 µm, Q = 1.7–2.8, Q m = 2.31 ± 0.25] elongate-ellipsoid, smooth, hyaline, inamyloid, thin-walled. Basidia 14–22 × 5–7 µm, clavate, with 4 sterigmata, thin walled. Cheilocystidia abundant, 28–36 × 7–12 µm, irregular in shape, lobe, smooth, hyaline, inamyloid, thin-walled. Pleurocystidia absent. Lamellar trama interwoven, hyphae 4–13 µm, cylindrical, smooth, hyaline, inamyloid, thin-walled. Pileipellis cutis of radially arranged hyphae 3–5 µm, cylindrical, yellowish brown, inamyloid, non-diverticulate, smooth to weakly incrusted. Pileocystidia 16–40 × 4–7 µm, cylindrical, hyaline, inamyloid, thin-walled. Pileus trama subregular, 5–12 µm, cylindrical, branched, smooth, inamyloid, thin-walled. Stipitipellis cutis, 3–8 µm, cylindrical, yellowish brown, smooth, thin-walled, non-incrusted. Stipe trama parallel, 3–6 µm, cylindrical, smooth, pale yellow, inamyloid. Caulocystidia abundant, 42–62 × 3–5 µm, cylindrical-flexuose, irregular in shape, sometimes occurring in short chains, clustered, smooth, hyaline, inamyloid thin walled. Clamp connections are present in all tissues.
Habitat and known distribution:—Fruiting gregarious to solitary on twigs and wood. Known from Indonesia (Java) (Wilson et al. 2004), Singapore (Corner 1996), and Thailand (This study).
Material examined:— THAILAND, Phatthalung Province, Khuan Khanun, sago palm (Metroxylon sagu) forest, 7°43´54´´N 99°59´46´´E, elevation 20.1 m, decaying wood and twigs, 24 October 2022, P. Nutaratat, J. Kumla, and N. Suwannarach, SDBR-TSU027.
Note:—The macroscopic and microscopic features of the Thai materials were similar to the descriptions by Corner (1996) and Wilson et al. (2004), but the basidiospores in the Thai materials (3–5.5 µm wide) were slightly wider than the descriptions of specimens (4–4.2 µm wide) by Corner (1996) and Wilson et al. (2004). The variability of the size of basidiospores may be influenced by the environment across a wide geographic range. Thai materials were found to belong to the C. indocta clade (FIGURES 2 and 3). Morphologically, C. indocta is similar to C. menehune. However, C. menehune has darker pileus (buff-brown to brownish-yellow), and diverticulate terminal cells are present (Desjardin et al. 1999). However, C. indocta formed a monophyletic clade and was separated from C. menehune (FIGURES 2 and 3).
description: Published as part of Kumla, Wiphawanee Phonrob Jaturong, Suwannarach, Nakarin, Khuna, Surapong, Nutaratat, Pumin, Wannathes, Nopparat & Lumyong, Saisamorn, 2024, Five new records of Collybiopsis (Agaricales, Omphalotaceae) in Thailand: a significant addition to the species diversity and global distribution of the genus, pp. 213-235 in Phytotaxa 650 (3) on pages 226-227, DOI: 10.11646/phytotaxa.650.3.3, http://zenodo.org/record/13367205