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. 2008 Jun:20:53-8.
doi: 10.3767/003158508X314732. Epub 2008 Apr 23.

Morphological and molecular characterisation of a new anamorphic genus Cheirosporium, from freshwater in China

L Cai  1 , X Y Guo, K D Hyde
Affiliations

Morphological and molecular characterisation of a new anamorphic genus Cheirosporium, from freshwater in China

L Cai et al. Persoonia. 2008 Jun.

Abstract

Cheirosporium gen. nov. is characterised by the production of sporodochial conidiomata, semi-macronematous to macronematous conidiophores that possess several distinct sterile branches, and cheiroid, smooth-walled conidia with rhexolytic secession. The 28S rDNA and ITS rDNA operon of this taxon were amplified and sequenced. A BLAST search revealed low homology between Cheirosporium triseriale and existing sequences in public databases, supporting the hypothesis that the species is new to science. Phylogenetic analysis showed that C. triseriale groups with Dictyosporium and allied species, and nests within the Pleosporales (Dothideomycetes, Ascomycota). Cheirosporium is morphologically distinct from the cheirosporous genera Cheiromyces, Cheiromycina, Dictyosporium, Digitomyces, Digitodesmium and Pseudodictyosporium and these differences are discussed.

Keywords: Pleosporales; ascomycetes; systematics; taxonomy.

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Figures

Fig. 1
Fig. 1
Phylogenetic tree generated from parsimony analysis based on 28S rDNA sequences. Data were analysed with random addition sequence, and treating gaps as missing data. Bootstrap values ≥ 50 % are shown above or below branches. Thickened branches indicate Bayesian posterior probabilities ≥ 95 %. The tree is rooted with Aniptodera chesapeakensis.
Fig. 2
Fig. 2
Phylogenetic tree generated from parsimony analysis based on ITS rDNA sequences. Data were analysed with random addition sequence and treating gaps as missing data. Bootstrap values ≥ 50 % are shown above or below branches. Thickened branches indicate Bayesian posterior probabilities ≥ 95 %. The tree is rooted with Botryosphaeria corticis.
Fig. 3
Fig. 3
Cheirosporium triseriale. a. Sporodochial conidiomata on the host surface; b. squash mount of the conidiophores and conidia; c, d. conidiophores bearing conidia (note numerous sterile apices of the conidiophores); e, f. individual conidiophores. Note the sterile branches; g–j. conidia. — Scale bars: a = 200 μm, b = 40 μm, c–j = 20 μm.
See this image and copyright information in PMC

References

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