The genus Cladosporium and similar dematiaceous ... - CBS - KNAW
The genus Cladosporium and similar dematiaceous ... - CBS - KNAW
The genus Cladosporium and similar dematiaceous ... - CBS - KNAW
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Schubert et al.<br />
Fig. 48. <strong>Cladosporium</strong> variabile (CPC 12753). A. Survey of hyphae that grow on the agar surface. Some of the fungal cells have a swollen appearance <strong>and</strong> could develop into<br />
a “foot cell” that gives rise to a conidiophore. B. A number of aerial hyphae obstruct the swollen, large structures on the agar surface, which give rise to conidiophores. Some<br />
of them appear ornamented. C. A series of conidia formed on a conidiophore (bottom of the micrograph). D. Detail of the ornamented conidia. <strong>The</strong> ornamentations are isolated<br />
<strong>and</strong> dispersed. Note also the ornamentation-free scar zone <strong>and</strong> the hilum of the left cell. E. Two conidia behind an aerial hypha. F. Two conidiophores forming secondary<br />
ramoconidia. Note the bulbous shape of the spore-forming apparatus. This micrograph is from an uncoated sample. Scale bars: A–C, F = 10 µm, D = 2 µm, E = 5 µm.<br />
Teleomorph: Davidiella variabile Crous, K. Schub. & U. Braun, sp.<br />
nov. MycoBank MB504583.<br />
Davidiellae tassianae similis, sed ascosporis maioribus, (22–)26–30(–35) × (7–)7.5–<br />
8(–9) µm, et ascis latioribus, plus quam 18 µm.<br />
Ascomata pseudothecial, black, superficial, situated on a small<br />
stroma, globose, up to 250 µm diam, with 1–3 ostiolate necks;<br />
ostioles periphysate, with apical periphysoids present; wall<br />
consisting of 3–6 layers of dark brown textura angularis, textura<br />
epidermoidea in surface view. Asci fasciculate, bitunicate,<br />
subsessile, obovoid to broadly ellipsoid, straight to slightly curved,<br />
8-spored, 70–95 × 18–28 µm; with pseudoparenchymatal cells<br />
of the hamathecium persistent. Ascospores tri- to multiseriate,<br />
overlapping, hyaline, with irregular lumina, thick-walled, straight<br />
to slightly curved, fusoid-ellipsoidal with obtuse ends, widest near<br />
the middle of the apical cell, medianly 1-septate, not to slightly<br />
constricted at the septum, at times developing a second septum<br />
in each cell, several ascospores with persistent, irregular mucoid<br />
sheath, (22–)26–30(–35) × (7–)7.5–8(–9) µm.<br />
Mycelium immersed <strong>and</strong> superficial, irregularly branched, aerial<br />
mycelium twisted <strong>and</strong> spirally coiled, 1–3 µm wide, septate,<br />
sometimes with swellings or small lateral outgrowths, hyaline<br />
to subhyaline, smooth, walls unthickened, hyphae which give<br />
rise to conidiophores somewhat wider, 3–4.5 µm, subhyaline to<br />
pale brown, almost smooth to minutely verruculose, sometimes<br />
enveloped by a polysaccharide-like cover. Conidiophores usually<br />
macronematous, but also micronematous, arising terminally<br />
from ascending hyphae or laterally from plagiotropous hyphae.<br />
Macronematous conidiophores erect, more or less straight to<br />
flexuous, often distinctly geniculate-sinuous forming lateral<br />
shoulders or unilateral swellings, sometimes zigzag-like or<br />
somewhat coralloid, nodulose, swellings at first terminal, then<br />
becoming lateral due to sympodial proliferation, often as distinct<br />
lateral shoulders, unbranched, sometimes once branched, 6–<br />
180 × (2.5–)3–6 µm, swellings (3–)6–11 µm wide, septate, not<br />
constricted at the septa, pale to medium olivaceous-brown or<br />
brown, usually verruculose, walls somewhat thickened, about 1 µm<br />
thick, sometimes appearing to be two-layered. Conidiogenous cells<br />
integrated, terminal <strong>and</strong> intercalary, cylindrical, nodulose to nodose,<br />
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