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Dothideomycetes Isthmoconidia
PhalangisporaRamaraomyces Tubeufiales a b s t r a c tThe hyphomycete Pseudogliophragma indicum produces loosely constructed and often frayed synnemata, with a brown stipe and a divergent capitulum with monoblastic conidiogenous cells and deeply constricted phragmoconidia. Ramaraomyces corticola was described nine years after Ps. indicum with very similar micro-morphological characters.Both genera are monotypic. The holotype of Ps. indicum is depauperate. We re-collected Ps.indicum near the type locality. In this paper, we lectotypify the genus and species with the original illustration, and epitypify the species with a new specimen. An ex-epitype culture was derived from the epitype specimen and used to sequence regions of the nuclear RNA operon to determine the phylogenetic relationships of the species. The fungus belongs to the recently described family Wiesneriomycetaceae in the Tubeufiales, forming a sister group with the sporodochial, slimy spored genus Wiesneriomyces. We clarify the generic concept of Pseudogliophragma, propose Ramaraomyces as a synonym, and provide a new description and illustration. Wiesneriomyces laurinus is reported for the first time from Canada.
Crown
Most hyphomycetous conidial fungi cannot be presently placed in a natural classification. They need recollecting and sequencing so that phylogenetic analysis can resolve their taxonomic affinities. The type species of the asexual genera, Bahusandhika, Cancellidium and Pseudoepicoccum were recollected, isolated in culture, and the ITS and LSU gene regions sequenced. The sequence data were analysed with reference data obtained through GenBank. The DNA sequence analyses shows that Bahusandhika indica has a close relationship with Berkleasmium in the order Pleosporales and Pseudoepicoccum cocos with Piedraia in Capnodiales; both are members of Dothideomycetes. Cancellidium applanatum forms a distinct lineage in the Sordariomycetes.
A new species, Aureobasidium khasianum, was found growing on decaying leaves of Wightia speciosissima (Paulowniaceae) in India. It is described here with newly observed morphological features such as formation of setae having adhering conidiogenous cells and producing monilioid conidia. A phylogenetic analysis based on ITS and LSU gene regions is provided to support the taxonomic treatment.
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