Abstract
Diversity of corticioid fungi (resupinate Basidiomycota), especially outside the northern temperate climatic zone, remains poorly explored. Furthermore, most of the known species are delimited by morphological concepts only and, not rarely, these concepts are too broad and need to be tested by molecular tools. For many decades, the delimitation of species in the genus Subulicystidium (Hydnodontaceae, Trechisporales) was a challenge for mycologists. The presence of numerous transitional forms as to basidiospore size and shape hindered species delimitation and almost no data on molecular diversity have been available. In this study, an extensive set of 144 Subulicystidium specimens from Paleo- and Neotropics was examined. Forty-nine sequences of ITS nuclear ribosomal DNA region and 51 sequences of 28S nuclear ribosomal DNA region from fruit bodies of Subulicystidium were obtained and analysed within the barcoding gap framework and with phylogenetic Bayesian and Maximum likelihood approaches. Eleven new species of Subulicystidium are described based on morphology and molecular analyses: Subulicystidium boidinii, S. fusisporum, S. grandisporum, S. harpagum, S. inornatum, S. oberwinkleri, S. parvisporum, S. rarocrystallinum, S. robustius, S. ryvardenii and S. tedersooi. Morphological and DNA-evidenced borders were revised for the five previously known species: S. naviculatum, S. nikau, S. obtusisporum, S. brachysporum and S. meridense. Species-level variation in basidiospore size and shape was estimated based on systematic measurements of 2840 spores from 67 sequenced specimens. An updated identification key to all known species of Subulicystidium is provided.
Highlights
The genus Subulicystidium was created by Parmasto (1968) to accommodate corticioid fungi with long subulate or sword-like cystidia with a unique morphology
Eleven new species of Subulicystidium are described based on morphology and molecular analyses: Subulicystidium boidinii, S. fusisporum, S. grandisporum, S. harpagum, S. inornatum, S. oberwinkleri, S. parvisporum, S. rarocrystallinum, S. robustius, S. ryvardenii and S. tedersooi
We describe 11 new species of Subulicystidium based on morphological evidence and rDNA internal transcribed spacer (ITS) and 28S sequence analyses
Summary
The genus Subulicystidium was created by Parmasto (1968) to accommodate corticioid fungi with long subulate or sword-like cystidia with a unique morphology. Some species records represent more than one continent but in all cases these reports are based on a morphological species concept (Boidin and Gilles 1988, Duhem and Michel 2001, Volobuev 2016). Overlap of spore size between species is reported, as well as high morphological variability of the spores within single collections (Liberta 1980, Hjortstam and Ryvarden 1986). This has led to doubts on the identity of some taxa. We focus on rich material with relatively short basidiospores, i.e. nonacicular and often less than 10 μm long, leaving out S. longisporum-like material for a future study
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