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Page number:67 
Remarks (internal):Cladosporium phyllactiniicola has to be compared with C. uredinicola and C. exile, the latter introduced in this paper as a new species. Cladosporium uredinicola, usually considered a hyperparasite on rust fungi but also recorded from downy and powdery mildews (Morgan-Jones & McKemy 1990, Heuchert et al. 2005), has longer conidiophores, longer, 0-2-septate intercalary conidia and longer, 0-3(-5)-septate secondary ramoconidia. Our single living isolate (ATCC 46649 = CPC 5390) of C. uredincola, putatively representative, was isolated from Cronartium fusiforme from North America, identified as C. uredinicola by Morgan-Jones & McKemy (1990) who compared it with Spegazzini's type specimen, and was further described by Ho et al. (1999). Unfortunately it is no longer sporulating. Phylogenetically this strain is quite distinct from C. phyllactiniicola (Fig. 1, part a vs. b; distance analyses in TreeBASE). Other strains identified as C. uredinicola proved to belong to species other than that represented by CPC 5390.
Cladosporium exile also isolated from chasmothecia of Phyllactinia guttata differs in having somewhat narrower conidiophores, narrower terminal and intercalary conidia, 2-3 µm wide, and longer and narrower secondary ramoconidia, 7-25(-35) x 2.5-3.5(-4) µm.

 
Description type:Original description 
Description:Cladosporium phyllactiniicola Bensch, Glawe, Crous & U. Braun, sp. nov. MycoBank MB517086. Figs 57-58.
Mycelium immersed and superficial, plagiotropous, ascending to erect, not dimorphic; hyphae sparingly branched, 1-5(-6) µm wide, septate, not constricted at septa, sometimes swollen, subhyaline to pale brown, minutely verruculose to irregularly rough-walled, especially at the base of conidiophores, sometimes forming ropes, often irregular in outline. Conidiophores macro- and micronematous, arising laterally and terminally from plagiotropous and ascending hyphae, erect, straight to slightly flexuous. Macronematous and semimacronematous conidiophores cylindrical-oblong, non-nodulose, sometimes geniculate towards the apex, unbranched or once branched, 6-105(-120) x 2.5-5(-6) µm, 0-6(-7)-septate, occasionally slightly constricted at septa, pale to pale medium brown or olivaceous-brown, smooth or almost so, walls unthickened in the younger conidiophores, thickened in the older ones, sometimes slightly attenuated towards the apex. Conidiogenous cells integrated, mainly terminal, cylindrical-oblong, sometimes slightly geniculate, 6-25 µm long, with 2-4 conspicuous, subdenticulate to denticulate loci, sometimes forming small clusters or situated on lateral shoulders formed due to sympodial proliferation or on small lateral proliferations, loci protuberant, 1-2 µm diam, thickened and darkened-refractive. Micronematous conidiophores narrowly cylindrical-oblong to mostly filiform, unbranched, non-geniculate and non-nodulose, often only as short lateral outgrowths of hyphae, 8-40 x 2-2.5 µm, with few septa, subhyaline, smooth, walls unthickened. Conidiogenous cells integrated, terminal, 7-15 µm long, with a single locus or up to three apical loci, 1-1.2 µm diam. Ramoconidia occasionally formed, up to 28 µm long, 3.5-4 µm wide, base about 3 µm wide. Conidia catenate, in branched chains, branching in all directions, up to four conidia in the unbranched terminal part, straight, small terminal conidia subglobose to obovoid, 3-6(-7) x 2-4 µm (av. ± SD: 4.2 ± 1.4 x 2.8 ± 0.8), aseptate, attenuated towards the base, broadly rounded at the apex, intercalary conidia limoniform to ellipsoid-ovoid, 5-10 x 3-4(-4.5) (av. ± SD: 6.2 ± 1.1 x 3.4 ± 0.6), 0(-1)-septate, secondary ramoconidia limoniform to usually narrowly to broadly ellipsoid-ovoid to subcylindrical, 5-17(-24) x (2-)3-4.5 µm (av. ± SD: 11.8 ± 4.2 x 3.7 ± 0.7), conidia formed by micronematous and semimacronematous conidiophores shorter and narrower, 0-1(-2)-septate, mainly aseptate, not constricted at septa, subhyaline to pale brown or pale olivaceous-brown, smooth or almost so to finely asperulate, walls unthickened to slightly thickened, often almost not attenuated towards apex and base, hila conspicuous, subdenticulate to denticulate, 0.5-2 µm diam, thickened and darkened-refractive; microcyclic conidiogenesis not observed.
Culture characteristics: Colonies on PDA olivaceous-grey to iron-grey, smoke-grey to pale olivaceous-grey due to aerial mycelium, reverse leaden-grey, felty-woolly, margin narrow, white, somewhat feathery, aerial mycelium sparse to abundant, felty, high, sometimes few small, not very prominent exudates, formed, sporulating. Colonies on MEA olivaceous-grey surface and reverse or grey-olivaceous to greenish grey on surface, with patches of white or smoke-grey due to dense abundant aerial mycelium, fluffy, woolly, margin narrow, white, glabrous to somewhat feathery, greenish olivaceous at margins due to profuse sporulation, wrinkled, sometimes radially furrowed, without exudates, sporulating. Colonies on OA olivaceous-grey to grey-olivaceous or olivaceous, whitish to smoke-grey due to aerial mycelium, reverse leaden-grey, olivaceous-grey to iron-grey, margin narrow, white, glabrous, aerial mycelium absent, diffuse to dense, low to high, fluffy to felty-woolly, without prominent exudates, sporulating.
Specimens examined: U.S.A., Seattle, University of Washington campus, 47.6263 -122.3331, isol. from chasmothecia of Phyllactinia guttata (Erysiphales) on leaves of Corylus avellana (Betulaceae), 2 Dec. 2004, D. Glawe, CBS H-20443, holotype; ex-type culture CBS 126355 = CPC 11830, CBS 126352 = CPC 11836, CBS 126353 = CPC 11823, CBS 126354 = CPC 11825.
Substrate and distribution: Mycophilic occurring on chasmothecia of Phyllactinia guttata; U.S.A.
 
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