Agaricus section Arvenses: three new species in highland subtropical Southwest China.
Agaricus is a genus of saprobic basidiomycetes with more than 400 species recognized worldwide, with about 50 species known in China. Our objective was to investigate three new species of section Arvenses in highland subtropical Southwest China. Agaricus guizhouensis is a new species characterized by a white pileus with yellowish squamules, small ellipsoid spores and cheilocystidia with yellowish-brown pigments; another new species, Agaricus longistipes is recognized by its slender stipe, and its elongate-ellipsoid basidiospores; the third new one, Agaricus megalocarpus is remarkable by its large size and its pileus surface covered with fine brown squamules. It is firstly reported for Guizhou Province that Agaricus abruptibulbus, Agaricus flocculosipes, and Agaricus subrufescens are illustrated. Two probable new species require further studying. A phylogenetic analyses of rDNA-ITS sequence data belonging to section Arvenses showed that the section Arvenses is monophyletic and can be subdivided in five branches, the branch of A. subrufescens and four clades (A-D). The eight species from highland subtropical Southwest China were distributed in all five branches, indicating that this highland is at the climatic crossroads. The white pileus trait and the potential interest are discussed. These data suggest a potential species richness that remains to be discovered.
College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China; Guizhou Provincial Institute of Crop Germplasm Resources, Guiyang 550006, PR China; Guizhou Key Laboratory of Agricultural Biotechnology, Guiyang 550006, PR China.
Yang
Y
Gui
Guizhou Provincial Institute of Crop Germplasm Resources, Guiyang 550006, PR China; Guizhou Key Laboratory of Agricultural Biotechnology, Guiyang 550006, PR China.
Guo-S
GS
Zhu
INRA, UR1264, Mycologie et Sécurité des Aliments, 33883 Villenave d'Ornon, France.
Philippe
P
Callac
Institute of Excellence in Fungal Research, and School of Science, Mae Fah Luang University, Tasud, Chiang Rai 57100, Thailand.
Kevin-D
KD
Hyde
Avda. Padre Claret 7, 5° G, 09400 Aranda de Duero, Burgos 09400, Spain.
Luis-A
LA
Parra
Institute of Excellence in Fungal Research, and School of Science, Mae Fah Luang University, Tasud, Chiang Rai 57100, Thailand.
Jie
J
Chen
Guizhou Provincial Institute of Crop Germplasm Resources, Guiyang 550006, PR China.
Tong-J
TJ
Yang
Guizhou Provincial Institute of Crop Germplasm Resources, Guiyang 550006, PR China.
Wan-B
WB
Huang
Guizhou Provincial Institute of Crop Germplasm Resources, Guiyang 550006, PR China.
Guang-L
GL
Gong
Guizhou Key Laboratory of Agricultural Biotechnology, Guiyang 550006, PR China; Guizhou Academy of Agricultural Sciences, Jinlong Community, Xiaohe District, Guiyang 550006, Guizhou, PR China. Electronic address: gzliuzuoyi@163.com.
Zuo-Y
ZY
Liu
D000364:Agaricus / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D002681:China; D002980:Climate; D016000:Cluster Analysis; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D010860:Pigments, Biological / Q000378:metabolism; D017422:Sequence Analysis, DNA; D013172:Spores, Fungal / Q000166:cytology
D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer; D010860:Pigments, Biological
Edible mushrooms; ITS sequences; Medicinal mushrooms; Phylogeny; Taxonomy