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Description type:Original description 
Description:Cladosporium psychrotolerans Zalar, de Hoog & Gunde-Cimerman, sp. nov. MB 492428. Fig. 9.
Mycelium partly superficial partly submerged; hyphae without extracellular polysaccharide-like material. Conidiophores erect or ascending, macronematous, stipes (10-)50-100(-150) x (3-)3.5-4(-7.5) µm, olivaceous-brown, smooth or almost so, thick-walled, regularly septate (cell length 10-40 µm), arising laterally from aerial hyphae, repeatedly dichotomously branched. Conidial chains branching in all directions, up to four conidia in the unbranched parts. Primary ramoconidia often formed, cylindrical, 19-43 x 3-4(-4.5) µm, aseptate, rarely 1-septate, with a broadly truncate base, 2-2.5 µm wide, unthickened or slightly thickened, somewhat darkened-refractive. Conidia smooth to minutely verruculose, light brown, non-septate, spherical to ovoid, length:width ratio = 1.3-1.4; conidial size (2.5-)3-4(-4.5) x (2-)2.5-3(-3) µm [av. (± SD) 3.4 (± 0.5) x 2.5 (± 0.2)]; secondary ramoconidia cylindrical, 0-1(-2)-septate, (5-)8-16(-36) x (2-)2.5-3(-5) µm [av. (± SD) 12.7 (± 6.5) x 3.0 (± 0.5)], with up to four distal scars. Conidiogenous scars thickened and conspicuous, protuberant, 0.5-2 µm diam.
Cultural characteristics: Colonies on PDA reaching 13-18 mm diam, velvety, olive (3F4) due to profuse sporulation, flat with straight margin. Reverse dark green. Colonies on OA reaching 13-15 mm diam, olive (2F8), of granular appearance due to profuse sporulation; aerial mycelium sparse. Margin regular. Reverse black. Colonies on MEA reaching 8-15 mm diam, olive (2F4), velvety, radially furrowed with undulate white margin. Colonies on MEA with 5 % NaCl growing faster than on other media, reaching 25-27 mm diam, olive (3E6) and granular due to profuse sporulation, either slightly furrowed or heavily wrinkled with regular or undulate margin. Reverse dark green.
Maximum tolerated salt concentration: 17 % NaCl after 14 d.
Cardinal temperatures: Minimum at 4 °C, optimum and maximum at 25 °C.
Type: Slovenia, from hypersaline water of Secovlje salterns, coll. and isol. S. Sonjak, May 1999, CBS-H 19730, holotype, culture ex-type EXF-391 = CBS 119412.
 
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