The genus Cladosporium and similar dematiaceous ... - CBS - KNAW

Schubert et al.
Fig. 12. Cladosporium bruhnei (CPC 12211) and its teleomorph Davidiella allicina. A–B. Macronematous conidiophores. C. Conidial chains. D. Micronematous conidiophore. E.
Ascomata of the teleomorph formed on the host. F–G. Asci. Scale bars: A–B, D, F = 10 µm, E = 200 µm.
Notes: Cladosporium bruhnei proved to be an additional component
of the herbarum complex. The species resembles C. herbarum s.
str. as already stated by Linder (1947), but possesses consistently
narrower conidia, usually 2.5–5 µm wide, and the conidiophores
often form only a single apical swelling. The species was described
by Bruhne (l.c.) as Hormodendrum hordei from Germany but type
material could not be located. Linder (1947) examined No. 1481a-5
(Canada, N. Quebec, Sugluk, on Elymus arenarius var. villosus,
31 Jul. 1936, E. Meyer), presumably in the National Museum, and
stated that this specimen agreed well with the description and
illustration given by Bruhne (l.c.). Although the species occurs
on numerous substrates and is widely distributed, it has not yet
been recognised as a distinct species since it has probably been
interpreted as a narrow variant of C. herbarum.
Based on morphology and DNA sequence data, the CBS strain
CBS 177.71 chosen by Prasil & de Hoog (1988) as representative
living strain of C. herbarum, rather clusters together with isolates
of C. bruhnei. The strain CBS 813.71 is an albino mutant of the
latter species as it does not appear to contain colour pigment.
Furthermore, all isolates from humans treated until now as C.
herbarum proved to be conspecific with the narrow-spored C.
bruhnei.
Although Davidiella tassiana (ascospores 17–25 × 6–8.5 µm,
RO) was treated as synonymous to D. allicina (ascospores 20–27
× 6–7 µm, UPS) in Aptroot (2006), they differ in apical ascospore
taper, with ascospores of D. allicina being acutely rounded, while
those of D. tassiana are obtusely rounded. The same ascospore
taper was also observed in the teleomorph of C. bruhnei, and thus
the name D. allicina is herewith linked to C. bruhnei, which is distinct
from C. herbarum, having D. tassiana as teleomorph.
Cladosporium herbaroides K. Schub., Zalar, Crous & U. Braun,
sp. nov. MycoBank MB504574. Figs 13–15.
Etymology: Refers to its morphological similarity to Cladosporium
herbarum.
Differt a Cladosporio herbaro conidiis polymorphis, 3–33 × (2–)3–6(–7) µm,
postremo latioribus, (3.5–)5–9(–11) µm, fuscis et crassitunicatis; et a Cladosporio
macrocarpo conidiophoris leniter angustioribus, 3–5 µm latis, nodulis angustioribus,
5–8 µm latis.
Mycelium branched, (1–)2–8 µm wide, septate, often with small
swellings and constrictions, subhyaline to pale brown or pale
olivaceous-brown, smooth or almost so to somewhat verruculose,
walls unthickened or almost so. Conidiophores macronematous
and micronematous, arising lateral from plagiotropous hyphae or
terminally from ascending hyphae. Macronematous conidiophores
erect, straight to slightly flexuous, often geniculate, nodulose, with
unilateral or multilateral swellings, often numerous swellings in
short succession giving them a gnarled appearance, often forming
somewhat protruding or prolonged lateral swellings or a branch-
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