Brachysporiella gayana Bat. 1952
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Descriptions
Brachysporiella gayana Bat. 1952
The conidiophores are composed of a simple main stalk which bears a single terminal conidiumat its apex and presumably on successive terminal ovoid to obpyriform percurrent proliferations. Some, but not all conidiophores, bear a few lateral 1- or a few-celled scattered or paired branches which bear a solitary terminal conidium with subsequent conidia produced on successive percurrent proliferations. Conidia are obovoid to obpyriform, uniformly pale brown to brown. predominantly 3-septate (pseudo-septate), with the walls progressively thinner toward the unfringed basal scar which is 2.7-4 um wide. Conidia measure 23.5-38 x 11.7-21.6um mostly 27-36 X 12.5-18um. The larger conidia are those which develop terminally on the main stalk. the lateral ones being smaller and somewhat paler.
The presence of branches on the main stalk of the conidiophore is evidently a variable character. In the type collection, and the other collections at my disposal, branches may be absent on some conidiophores which are robust and apparently mature. In one collection (DA0M 109267) only simple conidiophores were found: conidium characters match those of conidia produced on branched conidiophores in other collections.
Successive ovoid to obpyriform percurrent proliferations are usually present on the apex of themain stalk and its branches and it is likely that the apex of each proliferation was the site of a solitary conidium. Most proliferations seem to have arisen. it the apex of a conidiogenous cell, presumably from a half septum left by the seceded conidium. The wall of the proliferation may also extend down to the lower septum of a conidiogenous cell