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Issue: Vol. 668 No. 3: 16 Oct. 2024
Type: Article
Published: 2024-10-16
DOI: 10.11646/phytotaxa.668.3.2
Page range: 226-238
Abstract views: 185
PDF downloaded: 10

New species diversity and host association of Lactarius sect. Deliciosi: describing L. gibbosus and L. parvihatsudake (Russulaceae, Russulales) in southern China

Center for Medicinal Resources Research, Zhejiang Academy of Traditional Chinese Medicine, Tianmushan Road 132, Hangzhou 310007, P.R. China
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, Kunming 650201, P.R. China
College of Biological and Agricultural Sciences, Honghe University, Mengzi 661199, P.R. China
The Administration Bureau of Dr. Sun Yat-sen’s Mausoleum, Nanjing 210014, P.R. China
Zhejiang Tianmu Mountain National Nature Reserve Administration, Lin’an 311311, P.R. China
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, Kunming 650201, P.R. China
conservation ectomycorrhizal fungi host specificity new species Pseudolarix amabilis taxonomy Fungi

Abstract

Lactarius gibbosus and L. parvihatsudake, two red-colored species of Lactarius sect. Deliciosi are described as new from southern China. Lactarius gibbosus is a rare species, growing in fagaceous forest in southwestern China, similar to L. subindigo. Its pileipellis with slightly thick-walled swollen cells is unique in the section. The macrocystidia filled with golden yellow contents are another good character. This is the first report of red-colored species of L. sect. Deliciosi growing in fagaceous forest. Lactarius parvihatsudake grows in forest of Pseudolarix amabilis, an ancient relict Chinese tree only in eastern China. It has smaller basidiocarps and bigger spores than L. hatsudake. The discovery of this species added Pseudolarix to the potential host list of L. sect. Deliciosi. Phylogenetic analyses of the ITS region and glyceraldehyde-3-phophate dehydrogenase gene showed that L. gibbosus was a sibling of L. subindigo. These two species formed an early diverging lineage of L. sect. Deliciosi. Lactarius parvihatsudake was nested deeply in L. sect. Deliciosi but its closest relatives cannot be determined. These data update our understanding of the diversity of L. sect. Deliciosi in Asia and will hopefully help to understand the role of host shift in speciation of ectomycorrhizal fungi.

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