. Bulletin of the British Museum (Natural History) Botany. THE LICHENICOLOUS HYPHOMYCETES 259. lOum Fig. 38 Taeniolella verrucosa (hb. Christiansen 569—holotype). almost prostrate, often 1-2 branched at the base, dark brown, smooth-walled at first but some- times with the outer wall splitting to produce a coarsely verrucose ornamentation, thick-walled, septate, constricted at the septa, mainly 30-50 x 6-7 um. Conidiogenous cells monoblastic inte- grated, terminal, subcylindrical, dark brown, not well-defined with the terminal cells in turn acting as conidiogenous cells. Conidia adhering in cha
. Bulletin of the British Museum (Natural History) Botany. THE LICHENICOLOUS HYPHOMYCETES 259. lOum Fig. 38 Taeniolella verrucosa (hb. Christiansen 569—holotype). almost prostrate, often 1-2 branched at the base, dark brown, smooth-walled at first but some- times with the outer wall splitting to produce a coarsely verrucose ornamentation, thick-walled, septate, constricted at the septa, mainly 30-50 x 6-7 um. Conidiogenous cells monoblastic inte- grated, terminal, subcylindrical, dark brown, not well-defined with the terminal cells in turn acting as conidiogenous cells. Conidia adhering in chains, separating only with great difficulty, dry, acrogenous, doliiform, dark brown, 0-1 septate, only slightly constricted at the septum, generally with a coarsely verrucose ornamentation produced by the splitting and breaking up of the outer wall of the conidia, thick-walled, 1-septate conidia 10-13x8-10 um. Host: Arthonia impolita (Hoffm.) Borr., thallus. The infected areas of the thallus are dark brown to black due to the conidiophores and conidia of the fungus, but show little sign of actual damage. Distribution: Sweden. Known only from the type collection. Observations: Taeniolella verrucosa is a distinctive species differing from all others referred to the genus in that the conidia become coarsely verrucose due to a splitting and disintegration of the outer wall of the conidia. Of the species treated here, in the shape and size of the conidia it most closely resembles T. punctata but can easily be separated by the sculpturing of the conidia. T. delicata is also present in the type collection of T. verrucosa and the species occur mixed with one another in a few places on the thallus; they do, however, always retain their individuality and are easily separable from each Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resem
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