Paper Information

Journal:   ROSTANIHA   2004 , Volume 5 , Number 3; Page(s) 58 To 109.


Author(s):  ZARE R., GAMS W.
Species of Lecanicillium fonn slender aculeate phialides, mostly from procumbent or prostrate aerial hyphae, singly or in tenninal and intercalary whorls. Erect conidiophores with one or several whorls of phial ides may also occur, but the stipes are not differentiated from the subtending hyphae in wall thickness. Contrasting with Acremonium species, the phialide base is usually narrower than the subtending hypha. Occasionally an aculeate cell (originally differentiated as a phialide) becomes septate and produces secondary phialides. Conidia are generally elongate, adhering in heads or fascicles at the tips of the phialides, often at right angles to the phialide at maturity (LA TOUCHE 1947). Conidia adhering in fascicles at right angles to the phialide tip are seen only in Lecanicillium and Simplicillium; when present, they distinguish these genera from other verticillium-like anamorphs. In a few species or isolates, solitary conidia are fonned on each phialide. Primary elongate conidia are occasionally septate, but this feature seems to have little taxonomic significance. Conidia are sometimes dimorphic. This can have two reasons: either the primary conidia are longer than those formed subsequently on the same phialide tip, or the smaller conidia are fonned singly on a different kind of conidiogenous cells. These conidiogenous cells are either scattered laterally along the cells of fertile hyphae, they are short with a swollen base and narrow tip and soon collapse into inconspicuous denticles (aphanophialides in the sense of GAMS 1971), or short conidiiferous denticles appear on nodes of conidiogenous cells as they occur in Lecanicillium tenuipes (syn. Engyodontium aranearum (Cavara) W. Gams et al.) (GAMS et al. 1984). Dimorphic modes of sporulation are thus displayed by this species and by L. dimorphum, which both have in addition falcate phialoconidia borne on verticillate aculeate phialides. Lecanicillium dimorphum thus fonns a link between L. psalliotae and L. aphanocladii (the fonner Aphanocladium aranearum), which only fonns microconidia. Dictyochlamydospores characteristic of Pochonia and related genera and simple chlamydospores are absent in Lecanicillium. ...
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