Collybiopsis fulva J.S. Kim & Y.W. Lim, 2022

Kim, Ji Seon, Cho, Yoonhee, Park, Ki Hyeong, Park, Ji Hyun, Kim, Minkyeong, Kim, Chang Sun & Lim, Young Woon, 2022, Taxonomic study of Collybiopsis (Omphalotaceae, Agaricales) in the Republic of Korea with seven new species, MycoKeys 88, pp. 79-108 : 79

Collybiopsis fulva J.S. Kim & Y.W. Lim sp. nov.

Fig. 3E-F

Diagnosis.

This species has a pale orange to brownish-colored, 4-20 mm pileus, an orange white colored to light brownish colored, 7-30 × 0.7-1 mm stipe with pubescence, spheropedunculate, pleurocystidia, oblong to subcylindrical, 6.8-9.2 × 3.1-4.9 μm basidiospore, lobed, clavate with rostrate apex, 24.8-38.4 × 6.5-11.8 μm cheilocystidia.

Etymology.

Epithet " Collybiopsis fulva " referring to fox-colored pileus.

Holotype.

The Republic of Korea, Gyeonggi-do: Pocheon-si, Soheul-eup, Gwangneungsumogwon-ro 415, 37°45'17"N, 127°9'59"E, alt. 101 m, Sang Kook Han, 21 July 2015, KA15-0210 (GenBank accession no. ITS: OL467259; nrLSU: OL462795).

Description.

Pileus: 4-20mm, hemispherical, convex to plane, sometimes concave with slightly reflexed, wavy margin, hygrophanous, pale orange (6A3) to greyish orange, becoming more brownish to the center (5B4 to 7C4). Lamellae: distant, L = 16-28, l = 1-5, sinuate, broad, whitish to yellowish white (4A2) to brownish orange (6C4 to 7C4). Stipe: 7-30 × 0.7-1 mm, cylindrical, gradually widened towards the base, tomentose, apex orange white (5A2) to brownish orange (6C6), becoming dense downwards (6D8), covered with pubescence. Basidiospores: 6.8-9.2 × 3.1-4.9 μm (average 7.47 × 3.69 μm), Q = 2.05, oblong to cylindrical, smooth, colorless, non-dextrinoid, with drops. Basidia: 20.4-29.4 × 4.7-7.8 μm, 4-spored, narrowly clavate, sometimes constricted or curved. Cheilocystidia: (20.5) 24.8-38.4 × 6.5-11.8 μm, lobed, clavate, sometimes with rostrate apex. Pleurocystidia: 31.5-46.9 × 12-20.6 μm, spheropedunculate, obovoid, sometimes with mucronate apex. Trama hyphae: cylindrical to subinflated, irregular, thin-walled, smooth, branched, non-dextrinoid, 2.0-15 μm wide. Pileipellis: a cutis of cylindrical, thin-walled, 4-15 μm wide hyphae; terminal elements adpressed to suberect, narrowly clavate, thin-walled, with heavy annular ornamentation, 3-8 μm wide. Stipitipellis: a cutis of cylindrical, thin-walled, smooth, 5-15 μm wide hyphae. Caulocystidia: 45.6-108.3 (131) × 6.8-14.8 μm, cylindrical, irregular, curved. Clamp connections: present in all tissues.

Other specimens examined.

The Republic of Korea, Gyeonggi-do: Pocheon-si, Soheul-eup , Gwangneung forest exhibition hall, 37°45'19"N, 127°9'58"E, alt. 99 m, 8 July 2016, Sang Kook Han, KA 16-0428. The Republic of Korea, Gyeongsangnam-do: Geochang-gun, Mt. Gibaek , 35°43'6"N, 127°45'49"E, alt. 1095 m, 19 June 2013, Sang Kook Han, KA 13-0216 .

Habit and habitat.

Scattered or gregarious on the bark of deciduous trees or on the rotting branch of both broadleaf trees and conifers, in summer.

Distribution.

The Republic of Korea.

Remark.

Collybiopsis fulva morphologically resembles Co. menehune and Co. ramealis . They can be distinguished based on several morphological differences. Collybiopsis menehune has a longer stipe (15-60 mm length), denser lamellae, and larger basidiospores (7.5-9.5 × 3.5-4.2 μm) ( Desjardin et al. 1999). Collybiopsis ramealis has a smaller basidiocarp (2-20 mm), shorter basidiospores (7.8-11 × 2.5-4 mm) and different type of pileipellis ( Rameales -structure) ( Noordeloos 1983; Desjardin et al. 1997). Phylogenetically, Co. fulva is closely related to Co. ramulicola . Collybiopsis ramulicola differs in having a more yellowish pileus, fewer lamellae (9-12) that are brighter in color, a more reddish and thicker stipe (2-3 mm), and smaller sized cheilocystidia (23-27 × 3-6 mm) ( Deng et al. 2016).

Figures

Figure 3. Basidiomata and microscopic characters of the four new Collybiopsis species A, B Co. albicantipes (SFC 20170725 - 35) C, D Co. clavicystidiata (SFC 20180705 - 84) E, F Co. fulva (KA 15 - 0210) G, H Co. orientisubnuda (NIBRFG 0000502862). Scale bars: 1 cm (A, C, E, G); 20 µm (B, D, F, H). Abbreviations: s basidiospores; b basidia; ch cheilocystidia; p pleurocystidia; ca caulocystidia.