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

Fig. 3C-D

Etymology.

Epithet " Collybiopsis clavicystidiata " indicates that the new species has clavate cheilocystidia.

Holotype.

The Republic of Korea, Jeollanam-do: Jindo-gun, Jodo-myeon, Donggeocha island, 34°23'34"N, 125°93'84"E, alt. 70 m, 05 July 2018, Jae Young Park, Tae Heon Kim, SFC20180705-84, (GenBank accession no. ITS: OL467252; nrLSU: OL462817).

Diagnosis.

The prominent features of this species include a greyish orange to brownish, 6-45 mm pileus, whitish lamellae, a subinstitious, tomentose, whitish, 15-26 × 1.2-1.6 mm stipe, oblong to subcylindrical, 6.7-9.4 × 3.1-4.6 μm basidiospores, utriform, clavate, 20.1-37.5 × 6.8-12.2 μm cheilocystidia, and cylindrical, flexuose, irregular, 17-50 × 3.5-7 μm caulocystidia.

Description.

Pileus: 6-45 mm, convex to hemispherical, becoming plano-convex to flat with an uplifted margin with age; Surface smooth, dull, hygrophanous, greyish orange (6B3) to brownish (7D8 to E8) at the center, being whitish at the margin (4A2 to 6C8), being paler with age. Lamellae: subdistant, L = 20-32, l = 1-7, adnexed, white. Stipe: 15-26 × 1.2-1.6 mm, cylindrical, tomentose, subinsititious, whitish to reddish grey (9B2). Basidiospores: 6.7-9.4 × 3.1-4.6 μm, average 8.13 × 3.62 μm, Q = 2-2.4 (mean = 2.26), oblong to cylindrical, smooth, hyaline, non-dextrinoid, with drops. Basidia: 18.3-30 × 4.1-8.8 μm, 4-spored, narrowly clavate, narrowly utriform, often curved. Cheilocystidia: 20.1-37.5 × 6.8-12.2 μm, utriform, clavate, sometimes with mucronate apex. Pleurocystidia: absent. Trama hyphae: cylindrical, often subinflated, smooth, branched, non-dextrinoid, 2-12 μm wide. Pileipellis: transition between cutis and trichoderm, composed of cylindrical, with heavy annular ornamentation, 4-12 μm wide hyphae; terminal elements adpressed to suberect, cylindrical, clavate, often incrusted (often incrusted), thin-walled, 3-6 μm wide. Stipitipellis: a cutis of cylindrical, smooth, 2-7 μm wide hyphae. Caulocystidia: 17-50 × 3.5-7 μm, cylindrical, flexuose, irregular or curved. Clamp connections: present in all tissues.

Other specimens examined.

The Republic of Korea, Jeollanam-do: Haenam-gun, Mt. Duryun , 34°29'6"N, 126°38'54"E, alt. 169 m, 5 July 2018, Young Woon Lim, Abel Severin Lupala, Jun Won Lee, SFC20180705-26. The Republic of Korea, Seoul: Gwanak-gu, Gwanak-ro 1, Seoul National University, 37° 27' 37"N, 126° 56' 59"E, alt. 80m, 13 July 2018, Jae Young Park, SFC20180713-09 .

Habit and habitat.

Solitary to scattered on dead wood debris of conifers, in summer.

Distribution.

The Republic of Korea

Remark.

Collybiopsis clavicystidiata is morphologically similar to G. omphalodes and Co. menehune . Collybiopsis omphalodes differs in their larger pileus (2-30 mm), a darker colored stipe, smaller basidiospores (5-6 × 2.5-3 μm), and thinner hyphae in the pileipellis (5-8 μm wide). Collybiopsis menehune can be distinguished from Co. clavicystidiata by its larger pileus (8-30 mm), buff lamellae, longer stipe (15-60 mm), longer basidiospores (7.5-9.5 × 3.5-4.2 μm, Q = 2.2), and longer caulocystidia (16-67 × 3-5 μm) ( Desjardin et al. 1999). Co. clavicystidiata is phylogenetically close to Co. pseudomphalodes . Collybiopsis pseudomphalodes has relatively few references for comparison, but differences can be found in the lengths of the stipe (3-4 mm) and cheilocystidia (40 × 3 μm) when compared with Co. clavicystidiata ( Dennis 1961).

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.