Cladosporium longicatenatum Bensch, Crous & U. Braun, sp. nov. MycoBank MB814629. Figs 15-16.

Etymology: Name refers to the very long conidial chains, with up to 20 or even more conidia in a branched chain.

Mycelium abundant, loosely branched, Aliform, 1-3 [micro]m wide, multiseptate, without swellings and constrictions, subhyaline, pale or medium olivaceous or olivaceous-brown, surface ornamentation variable, smooth, verruculose or irregularly rough-walled, walls unthickened or slightly thick-walled, sometimes forming small stromatic hyphal aggregations of few swollen cells. Conidiophores micro- or semimacronematous, sometimes hardly distinguishable from hyphae, erect, straight or somewhat flexuous, filiform or narrowly cylindrical, neither nodulose nor geniculate, usually unbranched, rarely once branched, 13-250 x 2.5-3(-4) [micro]m, sometimes up to 650 [micro]m long, multiseptate, pale olivaceous or medium olivaceous-brown, smooth, verruculose, verrucose or irregularly rough-walled, especially towards the base of conidiophores, walls somewhat thickened, about 0.5 [micro]m thick. Conidiogenous cells integrated, usually terminal, cylindrical, 12-53 [micro]m long, neither geniculate nor nodulose, usually with 2-3 loci at the outermost apex, sometimes up to five loci situated at the laterally proliferated apex, loci protuberant, subdenticulate, 1-1.5(-2) [micro]m diam, somewhat thickened and darkened-refractive. Ramoconidia cylindrical, 22-42 x 2.5-3(-4) [micro]m, 0(- 1)-septate, base broadly truncate, 2.5-3(-4) [micro]m wide, not thickened, slightly refractive. Conidia catenate, in very long, usually loosely dichotomously branched chains, up to 12 conidia in the terminal unbranched part, up to 20 conidia or more in a chain, small terminal conidia narrowly ellipsoid, sometimes fusiform, (3.5-)5.5-7 x 2-2.5 [micro]m [av. ([+ or -] SD) 6.0 ([+ or -] 1.0) x 2.2 ([+ or -] 0.2)], subhyaline or pale olivaceous, attenuated towards apex and base, intercalary conidia narrowly ellipsoid orsubcylindrical, 7-17 x 2-2.5(-3) [micro]m [av. ([+ or -] SD) 11.0 ([+ or -] 3.4) x 2.4 ([+ or -] 0.3)], 0(- 1)-septate, with 1-2(-3) distal hila, 0.5-1 [micro]m diam, secondary ramoconidia subcylindrical or cylindrical, 10-30(-38) x 2.5-3.5 [micro]m [av. ([+ or -] SD) 18.8 ([+ or -] 7.4) x 2.9 ([+ or -] 0.4)], 0(-2)-septate, with (1-)2-3 distal hila, pale olivaceous or pale olivaceous-brown, lightmicroscopically smooth or almost so, verruculose or loosely irregularly rough-walled, outer wall seemingly detached, with SEM smooth or almost so or delicately irregularly reticulate, walls unthickened or almost so, hila 1-2 [micro]m diam, thickened and darkened-refractive; microcyclic Conidiogenous not observed.

Culture characteristics: Colonies on PDA attaining 45-59 mm after 14 d, iron-grey to olivaceous-black, reverse leaden-black to olivaceous-black, felty, margins white, narrow, glabrous to somewhat feathery, regular, aerial mycelium loose, diffuse to fluffy, growth flat, few prominent exudates formed. Colonies on MEA reaching 29-37 mm, olivaceous-grey to iron-grey with patches of smoke-grey, reverse olivaceous-grey to iron-grey, velvety to fluffy, margins white, narrow, glabrous, aerial mycelium loose diffuse to more densely and fluffy, growth low convex with somewhat elevated colony centre, radially furrowed, wrinkled, without exudates. Colonies on OA attaining 43-54 mm, grey-olivaceous to olivaceous-grey with patches of white or smoke-grey, reverse leaden-grey to iron-grey, velvety to fluffy, margins hyaline, glabrous, narrow, aerial mycelium fluffy, white to smoke-grey, low to high, growth flat, without exudates; sporulation profuse on all...