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However, asci in some genera or species can occur in numbers of one (e.g. Monosporascus cannonballus), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. Tympanis ) with hundreds of conidia, or the ascospores may fragment, e.g. some Cordyceps , also filling the asci with smaller cells.
The asci are globose, deliquescent, and scattered throughout the interior cavity i.e. as in Eurotium or arising in tufts from the basal region of ascocarps as in Erysiphe. In this case the ascocarp is round with the hymenium enclosed, so the spores do not automatically get released, and fungi with cleistothecia have had to develop new ...
As an ascomycete, Ceratocystis coerulescens produces ascospores encased as groups of eight in asci. The asci are protected by a perithecium, a flask-shaped ascocarp, in which the pathogen overwinters. Ascospores are the sexual spores and are far less common than the asexual spores known as conidia.
The defining feature of this fungal group is the "ascus" (from Ancient Greek ἀσκός (askós) 'sac, wineskin'), a microscopic sexual structure in which nonmotile spores, called ascospores, are formed. However, some species of Ascomycota are asexual and thus do not form asci or ascospores.
The asci have an apical tholus (thickened inner apex) and narrow ocular chamber (small space at the tip), often with an amyloid ring-structure. Asci are clavate (club-shaped). [1] Ascospores typically number eight per ascus, sometimes reduced to 2–4.
The asci are cylindrical with a thickened ascus tip. Ascospores are usually cylindrical, ... Genera. Updated in 2020 (with numbers of species) [3] Akanthomyces ...
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The paraphyses are abundant, hyaline (transparent or glass-like), persistent. The asci are 8-spored, unitunicate, pedicellate, persistent, with a J+ or J−, apical ring. Ascospores hyaline, multi-septate, often guttulate, lacking any mucilaginous sheath or appendages. The asexual morph was undetermined (as of March 2021). [10]