Abstract
Rhodactina is a small sequestrate genus in Boletaceae with two described species, R. himalayensis and R. incarnata. Phylogenetic analyses of a three-gene dataset including atp6, tef1 and rpb2 of Rhodactina species along with selected Boletaceae species showed that all Rhodactina species formed a monophyletic clade, sister to the genera Spongiforma and Borofutus in subfamily Leccinoideae with high support. All of the taxa in the clade have a similar chemical reaction in which basidiospores turn purplish, purplish red to violet or violet grey when in contact with potassium hydroxide. The molecular analyses also showed that all Rhodactina specimens collected from Ubon Ratchathani province, northeastern Thailand, belong to a new species. Morphologically, the new species is different from others by having a markedly prominent hilar appendage and a terminal hilum on its basidiospores. Thus, the new species, Rhodactina rostratispora, is introduced with detailed macroscopic and microscopic descriptions and illustrations.
Highlights
At present, there are only two described Rhodactina species, R. himalayensis and R. incarnata, both of which have been reported to occur in northern Thailand (Chandrasrikul et al 2011)
The authors could not obtain tef1 and rpb2 sequences from R. incarnata (CMU25116) nor rpb2 sequence from R. himalayensis (CMU25117)
The 3-gene phylogram indicated that all selected collections of the new taxon R. rostratispora formed a monophyletic group with high bootstrap support sister to R. incarnata within the Rhodactina clade (Figure 1)
Summary
The genus Rhodactina Pegler & T.W.K. Young was first described in 1989 with R. himalayensis Pegler & T.W.K. Young, from northwestern India, as the type species. Santhiti Vadthanarat et al / MycoKeys 29: 63–80 (2018). Trappe & Lumyong was described and the known distribution of R. himalayensis was extended to Chiang Mai Province, northern Thailand. Based on the phylogenetic analyses of atp sequences, the genus was moved to the family Boletaceae Chevall (Yang et al 2006). At present, there are only two described Rhodactina species, R. himalayensis and R. incarnata (http://www.indexfungorum.org/Names/Names.asp), both of which have been reported to occur in northern Thailand (Chandrasrikul et al 2011)
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