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Page number:21 
Remarks (internal):Cladosporium asperulatum is morphologically comparable with C. subtilissimum but the latter species differs in having 0-4-septate, somewhat shorter conidiophores and somewhat wider conidia [4-32(-37) x 3-5(-6) µm] (Schubert et al. 2007b). Cladosporium cladosporioides is easily distinguishable based on its smooth conidia and somewhat wider conidiophores, and C. perangustum introduced below as a new species possesses shorter and somewhat narrower conidiophores, narrower conidia, (1.5-)2-3(-3.5) µm, and narrower conidiogenous loci and hila, 0.8-1.5(-1.8) µm. The species clustered as a sister to C. myrtacearum (Fig. 1, part a) and formed a distinct lineage for both TEF and ACT (distance analyses in TreeBASE).
The isolate from North America (CBS 113744) differs slightly from the other two isolates in lacking mycelial ropes, and having shorter conidiophores with few, often somewhat darkened septa, slightly narrower conidiogenous loci and hila, somewhat shorter globose, subglobose or obovoid small terminal conidia (2.5-5 x 2-3 µm) and somewhat wider intercalary conidia (3-4 µm). Although morphologically and phylogenetically (Figs 1, part a) slightly different, this isolate is tentatively maintained in the new species. Additional isolates are needed to clarify whether these differences are due to intra- or interspecific variation.

 
Description type:Original description 
Description:Cladosporium asperulatum Bensch, Crous & U. Braun, sp. nov.
MycoBank MB517072. Figs 7-9
Mycelium immersed, sparingly superficial; hyphae unbranched or very sparingly branched, 2-4.5 µm wide, septate, not constricted at septa, subhyaline to pale or medium olivaceous-brown, smooth to minutely verruculose or irregularly verrucose, walls unthickened or almost so, sometimes forming ropes. Conidiophores macro- and micronematous, solitary, arising terminally or laterally from plagiotropous or ascending and erect hyphae, erect, straight to slightly flexuous, cylindrical-oblong, sometimes slightly geniculate towards the apex, non-nodulose, (15-)45-210(-360) x (2-)3-4(-5) µm, sometimes up to 5 µm wide at the base, unbranched, occasionally branched, branches below the apex or at a lower level, usually below a septum, sometimes up to 105 µm long, pluriseptate with 0-12 septa, not constricted, pale to medium olivaceous-brown, paler towards the apex and sometimes attenuated, smooth to asperulate or minutely verruculose, walls slightly thickened; micronematous conidiophores filiform or narrowly cylindrical-oblong, about 2 µm wide, paler and narrower, subhyaline or pale olivaceous-brown, mostly with a single apical scar. Conidiogenous cells integrated, mainly terminal, cylindrical-oblong, sometimes slightly geniculate-sinuous towards the apex, 22-38 µm long, smooth or almost so, with 2-4 apical loci, protuberant, subdenticulate, sometimes situated on peg-like prolongations, 1-2 µm diam, thickened and darkened-refractive. Ramoconidia cylindrical-oblong, 15-50 x 3-4 µm, 0(-1)-septate, concolouress with tips of conidiophores, smooth or almost so, base broadly truncate, (2.2-)2.5-3(-3.2) µm wide, unthickened. Conidia catenate, in branched chains, up to 8(-10) conidia in the terminal unbranched part of the chain, small terminal conidia obovoid, 4.5-7(-8) x 2-3(-3.5) µm (av. ± SD: 5.6 ± 1.0 x 2.6 ± 0.5), intercalary conidia ovoid, fusiform to ellipsoid, 5-11(-13) x 2.5-3(-4) µm (av. ± SD: 8.0 ± 2.1 x 2.8 ± 0.4), aseptate, secondary ramoconidia ellipsoid, fusiform, subcylindrical, (7.5-)9-26(-37) x (2.5-)3-4(-5) µm (av. ± SD: 18.3 ± 6.6 x 3.4 ± 0.6), 0(-1)-septate, very rarely with a second septum, not constricted at septa, subhyaline to pale olivaceous-brown, smooth to minutely verruculose or irregularly rough-walled (LM), under SEM loosely verruculose or surface with irregularly reticulate structure or embossed stripes probably caused by diminishing turgor and shriveling of tender conidia, walls slightly thickened, attenuated towards apex and base, hila protuberant, subdenticulate, 0.8-2 µm diam, thickened and darkened-refractive; microcyclic conidiogenesis not observed.
Culture characteristics: Colonies on PDA attaining 48-53 mm diam after 14 d, olivaceous-grey, iron-grey or grey-olivaceous at margins, sometimes zonate, reverse leaden-grey, greyish blue to iron-grey, powdery to fluffy or hairy, margin white, narrow, glabrous, aerial mycelium abundantly formed, dense, fluffy and high in colony centre, growth flat to low convex with somewhat elevated colony centre, without prominent exudates, sporulation profuse. Colonies on MEA reaching 45-64 mm diam after 14 d, olivaceous-grey to pale greenish grey, reverse olivaceous-grey to iron-grey, powdery to fluffy, margin white to smoke-grey, narrow, regular, glabrous to feathery, sometimes radially furrowed, aerial mycelium abundant, several prominent exudates formed appearing blackish, sporulation profuse.
Specimens examined: India, isol. from Eucalyptus leaf litter (Myrtaceae), 1 Mar. 2004, coll. W. Gams, isol. P.W. Crous, CBS 126339 = CPC 11158. Portugal, isol. from Protea susannae (Proteaceae), 1 May 2007, P.W. Crous, CBS H-20424, holotype; ex-type culture CBS 126340 = CPC 14040. Cf. asperulatum: U.S.A., isol. from grape bud, F.M. Dugan, 208 db sci 1 = CBS 113744.
Substrate and distribution: On plant material; India, Portugal, U.S.A.
 
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