Ascomycota, Pezizomycotina, Capnodiales, Cladosporiaceae. Genus: CLADOSPORIUM
Cladosporium allicinum (Fr.) Bensch et al.
member of C. herbarum complex
Latest update: 19 April 2024
Colony characteristics
Colonies (PDA, 2 wk, 25ºC) reaching 22-32 mm diam, olivaceous grey to grey, with abundant aerial mycelium, velvety to floccose; margin narrow, white.
Microscopy
Hyphae mostly about 1.5 μm wide, mixed with broader hyphae up to μm wide and slightly constricted at the septa, (sub)hyaline, smooth-walled or slightly verruculose. Conidiophores erect, straight or somewhat flexuous, nodulose, unbranched or poorly branched, 50-300 μm, (2-)3-5 μm wide, swellings (4-)5-8 μm wide, septate without constrictions at septa, subhyaline to pale brown smooth-walled or verruculose, walls becoming thicker with age. Conidiogenous cells integrated, sympodial, 15-40 μm long, producing several acropetal chains of conidia from prominent denticles. Conidia broadly fusiform, subspherical when terminal, 4-9 × 2.5-3.5 μm, non-septate; ramoconidia (sub)cylindrical, 10-24 × 3-5 μm, rarely up to 40 μm long, 0-1(-3)-septate, subhyaline to pale brown, verrucose, rather thin-walled; conidial base protuberant, 1-2 μm wide, darkened. Heterothallic. Ascomata black, inserted on small stromata, spherical, up to 250 μm diam; ostioles with periphyses; walls red brown, 3-6-layered, textura angularis. Asci bitunicate, broadly ellipsoidal, 65-90 × 16-25 μm. Ascospores tri- to multiseriate, hyaline, thick-walled, fusoid-ellipsoidal with broad base and narrower proximal end, with one median septum, 25-30 × 6-7 μm.
Pathogenicity
RG-1, BSL-1. Common saprobe on plant leaves. Grassi et al. (2023) reported a lethal disseminated infection in a captive African bullfrog.
References
Schubert et al. (2007), Bensch et al. (2012).
Nomenclature
Sphaeria allicina Fries – Kon. Svenska Vetensk-Akad. Handl., Ser. 3, 38: 247, 1817 ≡ Davidiella allicina (Fries) Crous & Aptroot, in Aptroot – Biodiversity Ser. 5: 30. 2006 ≡ Cladosporium allicinum (Fries) Bensch, U. Braun & Crous, in Schubert, Braun, Groenewald & Crous – Stud. Mycol. 72: 50, 2012; type strain: not indicated.
Hormodendrum hordei Bruhne, in Zopf – Beitr. Physiol. Morph. Nied. Org. 4: 1. 1894 [non Cladosporium hordei Passerini – Herbor. Envir. Saintes 1884-1885: 32, 1887] ≡ Cladosporium bruhnei Linder – Bull. Natl. Mus. Canada 97: 259, 1947 (name change); type strain: CBS 121624.
