Abstract
The type of Rossbeeverabispora and additional collections from the type location and adjacent areas were studied. Molecular data for R.bispora derived from the new collections are provided. In addition, R.griseobrunnea, a new species of Rossbeevera, is described from Xiangtoushan National Nature Reserve, Guangdong Province of China. The new species is characterized by its globose to subglobose sequestrate basidiomata with grayish white to grayish brown pileus, pale bluish discoloration in some parts of the hymenophore when injured becoming rusty brown to dark brown after being exposed to the air, fusoid (star-shaped in cross section) basidiospores 17–20 × 9–12 μm, and subcutis elements in the pileus. Based on multi-locus (ITS+nrLSU+tef1-α+rpb2) molecular phylogenetic analyses, both species appear as sister to R.paracyanea. We present color photos, macro- and micro-description, SEM basidiospores, molecular affinities of the species and compare them with morphologically similar taxa within the genus. A key to the species known from northern and southern hemispheres is provided.
Highlights
IntroductionLebel & Orihara, a sequestrate ectomycorrhizal genus of Boletaceae, was erected in 2012 to accommodate Chamonixia pachydermis Zeller & C.W. Dodge as the type of the genus (Lebel et al 2012)
Species of Rossbeevera are easy to recognize in the field as they have rubbery sequestrate basidiomata, with or without bluish discoloration of either the pileus or the hymenophore and usually a thin pileipellis
The Q values [(1.63–1.83(–1.90), Qm = 1.75 ± 0.11] of basidiospores derived from the new collections are slightly higher than the type material of R. bispora
Summary
Lebel & Orihara, a sequestrate ectomycorrhizal genus of Boletaceae, was erected in 2012 to accommodate Chamonixia pachydermis Zeller & C.W. Dodge as the type of the genus (Lebel et al 2012). Species of Rossbeevera are easy to recognize in the field as they have rubbery sequestrate basidiomata, with or without bluish discoloration of either the pileus or the hymenophore and usually a thin pileipellis. They have a hymenium that is developed when the basidiomata is immature and collapses at maturity, and ornamented basidiospores with 3–5 longitudinal ridges (Lebel et al 2012, Orihara et al 2016)
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