Abstract
This study presents Paxilloboletus gen. nov., a new lamellate bolete genus represented by two tropical African species, Paxilloboletus africanus sp. nov. and Paxilloboletus latisporus sp. nov. Although the new taxa strongly resemble Paxillus (Paxillaceae), they lack clamp connections and form a separate generic clade within the Boletaceae phylogeny. The new species are lookalikes, morphologically only separable by their spore morphology. Descriptions and illustrations of the new genus and new species are given, as well as comments on ecology, distribution, and morphological differences with other gilled Boletaceae.
Highlights
IntroductionOur survey of bolete diversity in tropical Africa (here restricted to suborder Boletineae) has resulted in a collection of specimens both with poroid and with lamellate hymenophores
Over the years, our survey of bolete diversity in tropical Africa has resulted in a collection of specimens both with poroid and with lamellate hymenophores
Over the years several Paxillus and Phylloporus species have been recombined into new genera (e.g., Gilbert 1931; Singer 1942; Bresinsky et al 1999; Farid et al 2018; Vadthanarat et al 2019), some outside the Boletineae, and a few new species have been described in new lamellate genera (Singer and Digilio 1952; Zhang and Li 2018), resulting in a total of six lamellate lineages in the Boletineae: Paxillus, Phylloporus, Phyllobolites Singer (Boletaceae), Phylloboletellus Singer (Boletaceae), Phylloporopsis Angelini, Farid, Gelardi, ME Sm., Costanzo & Vizzini (Boletaceae), and Erythrophylloporus Ming Zhang & TH Li (Boletaceae)
Summary
Our survey of bolete diversity in tropical Africa (here restricted to suborder Boletineae) has resulted in a collection of specimens both with poroid and with lamellate hymenophores. (Boletaceae) are the most well recognized and globally distributed Boletineae with lamellate hymenophores. Hitherto only Paxillus and Phylloporus are known from tropical Africa, with 6 of the 38 known Paxillus species and 15 of the 86 known Phylloporus species occurring in the region (Kirk 2021; Heinemann and Rammeloo 1986, 1987a). (Boletaceae), so far only known from tropical Africa Based on a combination of phylogenetic and morphological characters, we here introduce the seventh lamellate genus in the Boletineae, Paxilloboletus gen. nov. (Boletaceae), so far only known from tropical Africa
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