Perrotia alba Dennis 1961
Details
Biostatus
Nomenclature
Classification
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Descriptions
Perrotia alba Dennis 1961
Perrotia alba Dennis 1961
Perrotia alba Dennis 1961
The hairs of this species are finely granulate throughout most of their length and remain so after pre-treatment with 5% KOH and staining with Melzer's reagent. Raitviir (1970) suggested that, on this basis, the species may deserve separation from Perrotia which he considered to typically have encrusted hairs which appear smooth after similar treatment. However, much variation is evident in the surface ornamentation of the hairs in the various species of both Perrotia and Lachnellula. Even in P. flamea the hairs may remain partially granulate in Melzer's reagent and an attempted segregation of genera on this basis alone seems unwarranted.
The form of the asci in P. alba is typical of the genus and the spores also are very similar in shape to those of P. flamea. The excipular structure is perhaps rather atypical, but the arrangement of the hyphae at a large angle to the surface and development of a cellular surface layer is similar to that in other species of the genus.