Collybiopsis baiyunensis sp. nov. (Omphalotaceae, Agaricales) from Baiyun Mountain, Southern China
Author
Liu, Xiao-Chun
School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China.
Author
Lin, Zhi-Jun
School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China.
Author
Liang, Ying-Shan
0000-0001-6001-4752
School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China.
liangysh37@mail2.sysu.edu.cn
Author
Cao, Li-Xiang
0000-0001-7179-6956
School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China.
qiulh@mail.sysu.edu.cn
Author
Qiu, Li-Hong
0000-0001-9930-292X
School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China. & School of Life Science, Sun Yat-sen University, Guangzhou 510275, P. R. China.
qiulh@mail.sysu.edu.cn
text
Phytotaxa
2024
2024-03-11
640
2
183
195
http://dx.doi.org/10.11646/phytotaxa.640.2.7
journal article
10.11646/phytotaxa.640.2.7
1179-3163
13213586
Collybiopsis baiyunensis
X.C. Liu & L.H. Qiu
,
sp. nov.
(
Figs. 2
,
3
)
MycoBank: MB 850229
Etymology:—The epithet
“
baiyunensis
” refers to the location where the
type
specimen was collected, Baiyun Mountain, Guangzhou,
Guangdong Province
,
China
.
Holotype
:—
CHINA
.
Guangdong Province
,
Guangzhou City
,
Baiyun Mountain
,
23°10′16″N
113°17′32″E
, elev.
240 m
,
16 August 2021
,
L.H. Qiu
,
GDGM93885
,
GenBank
acc. no.: OR598795 for ITS, OR598808 for nrLSU.
Diagnosis:—This species is distinguished from other
Collybiopsis
species
by its light brown to yellowish brown pileus with reddish orange to reddish brown disc and whitish margin, a cutis pileipellis composed of subparallel, sometimes intertwined hyphae, and clavate to broadly clavate or spheropedunculate cheilocystidia.
Description:—
Pileus
23–50 mm
in diam, hemispherical to convex when young, becoming applanate at maturity, sometimes with a curved or raised margin; surface dry, smooth, dull; reddish orange (#A0522D) to reddish brown (#601F00) at the disc, light brown (#E9C68D) to yellowish brown (#B88951) towards the margin, usually whitish (#FFFDF8) at the margin.
Lamellae
adnexed, subdistant, L = 25–37, l = 1–6, white to light brown in color.
Stipe
30–85 ×
2.4‒4.1 mm
, cylindrical, central, hollow, surface dry, yellowish brown (#B88951) to reddish brown (#601F00), sometimes light brown (#E9C68D) at upper half, reddish brown (#601F00) at lower half, base slightly thickened with white mycelium.
Smell
indistinctive.
Taste
not obtained.
Basidiospores
[130/5/3] (6.2–) 6.8–9.5 (11.3) × (2.9–) 3.3–4.5 (–4.9) μm, avl × avw = 8.2 × 3.9 µm, Q = (1.84–) 1.87–2.33 (–2.40), Q
m
= 2.10 ± 0.14, oblong to subcylindrical, smooth, thin-walled, hyaline in 5 % KOH, non-dextrinoid.
Basidia
(20.2–) 20.6–27.7 (31.1) × (5.2–) 5.5–8.4 (–8.6) μm, avl × avw = 23.7 × 7.1 µm, 4-spored, hyaline, thin-walled, clavate, sometimes constricted or curved.
Cheilocystidia
(15.6–) 16.6–32.6 (37.7) × (8.3–) 8.8–13.6 (15.6) μm, avl × avw = 22.8 × 10.9 µm, clavate to broadly clavate, spheropedunculate, sometimes with obtuse or slightly acute apex, thin-walled, smooth.
Pleurocystidia
absent.
Trama hyphae
cylindrical, subparallel in arrangement, some part inflated, hyaline, thin-walled, smooth, non-dextrinoid, 2.3–14.2 µm in diam, avw = 4.7 µm.
Pileipellis
a cutis, hyphae subparallelly arranged, sometimes intertwined, 3.0–7.5 μm wide, avw = 4.8 µm, cylindrical, hyaline, thin-walled, smooth.
Stipitipellis
a cutis made up of cylindrical, parallel-arranged hyphae, thin-walled, smooth, 2.2–10.3 µm in diameter, avw = 5.5 µm.
Caulocystidia
(17.2) 21.2–71.2 (100.6) × (3.3–) 3.6–6.4 (–7.0) μm, avl × avw = 39.5 × 4.6 µm, abundant, cylindrical, flexuose, thin-walled, hyaline.
Clamp connections
present in all tissues.
FIGURE 1.
Maximum likelihood phylogenetic tree generated from the combined ITS + nrLSU dataset.
ML-BS ≥ 70 % and BI-PP ≥ 0.95 are shown above or below the branches. New species is indicated with an asterisk.
FIGURE 2.
Collybiopsis baiyunensis
sp. nov.
: a–g. Basidiomata (a–b: K17050311; c: GDGM93885, holotype; d–e: GDGM93884; f: GDGM93886; g: GDGM93887) Scale bar: a–g = 1 cm. Photos by L.H. Qiu and X.C. Liu.
FIGURE 3.
Microscopic features of
Collybiopsis baiyunensis
sp. nov.
: a. Basidiospores; b. Basidia; c. Cheilocystidia; d. Stipitipellis showing caulocystidia; Scale bar: a–c = 10 μm; d = 20 μm. Drawings by X.C. Liu.
Habitat:—Solitary or scattered in leaf litter or on living trees of an evergreen broadleaf forest. Distribution:—Currently known from
Guangdong Province
,
China
.
Additional specimens examined:—
CHINA
.
Guangdong Province
,
Guangzhou City
,
Baiyun Mountain
,
16 August 2021
, coll:
X.X. Huang
GDGM93884
;
29 May 2022
, coll:
Z.J.
Lin
&
Y.S. Liang
GDGM93886
;
14 September 2023
, coll:
X.C. Liu
GDGM93887
.
Guangdong Province
,
Zhaoqing City
,
Dinghushan Biosphere Reserve
,
3 May 2017
, coll:
L.H. Qiu
K17050311
;
ditto
29 June 2017
, coll:
L.H.
Qiu
H17062908,
GDGM93883
.