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Species MB501007 Mycosphaerella maxii Crous 2006   Bibliography: Crous, P.W.; Groeneveld, J.Z., 2006, Fungal Planet no. 6: (more info) Year of publication: 2006 Status of the name: basionym; legitimate MycoBank's opinion: this name is a synonym of Teratosphaeria maxii (Crous) Crous & U. Braun 2007 (MB504480) Classification: Fungi, Ascomycota, Pezizomycotina, Dothideomycetes, Pleosporomycetidae, Pleosporales, Pleosporaceae, Teratosphaeria Obligate synonym(s): Teratosphaeria maxii (Crous) Crous & U. Braun 2007 [LEG; MB504480] Morphic status: Teleomorph (anamorph connection(s) unknown or not recorded) Taxonomic synonym(s): Ordered by epithet name none Descriptions: Latin diagnosis (Crous, P.W.; Groeneveld, J.Z. 2006, Fungal Planet no. 6) Latin diagnosis: Mycosphaerellae bellulae et M. alistairii similis, sed ascosporis majoribus, (15-)17-19(-22) x 4-5(-6) µm, differens. Typus: South Africa, Western Cape Province, Bettie's Bay, Harold Porter Botanical Garden, on leaves of Protea repens, 4 Jan. 2006, collected by M. Crous & P.W. Crous, CBS-H 19774, holotypus; cultures ex-type CPC 12805 = CBS 120137, CPC 12806-12807; Hermanus, Rotary road on top of mountain, on leaves of P. repens, 31 Dec. 2005, collected by P.W. Crous, CPC 12943-12945. Original description (Crous, P.W.; Groeneveld, J.Z. 2006, Fungal Planet no. 6) Description: Leaf spots amphigenous, subcircular, 2-7 mm diam, sunken, grey-brown to medium brown with a raised, dark brown border. Ascomata pseudothecial, substomatal, globose, dark brown, up to 200 µm diam, ostiolar channel lined with periphyses; wall consisting of 2-3 layers of brown cells of textura angularis. Asci aparaphysate, fasciculate, bitunicate, though additional layers are discernable in the ascus wall, obovoid to broadly ellipsoidal, straight to slightly curved, 8-spored, 30-50 x 9-17 µm. Ascospores bi- to tri-seriate, overlapping, hyaline, guttulate, thin-walled, straight to slightly curved, fusoid-ellipsoidal with obtuse ends, widest in the middle of the apical cell, 1-septate, constricted at the septum, tapering towards both ends, but more prominently towards the lower end, (15-)17-19(-22) x 4-5(-6) µm; ascospores seen to turn brown in some over-mature asci. Ascospores germinating from polar ends, germ tubes more or less parallel to the long axis of the spore, becoming slightly distorted, 4-6 µm wide, but remaining hyaline. Cultural characteristics: Colonies on 2 % potato-dextrose agar (PDA; Difco) reaching 20 mm diam after 5 weeks at 25 °C; erumpent, spreading, with smooth but uneven margins; centre white due to aerial mycelium, ringed by a smoke-grey zone, and then by an outer olivaceous-grey margin; diffuse yellow pigment visible in agar; reverse olivaceous-grey in centre, with the outer margin iron-grey. Colonies have highly characteristic aerial hyphae that are hyaline, thick-walled (two-layered), with numerous septa, producing nodular outgrowths at septa, and with large guttules visible in the cells. With age, colonies produce large orange "balls" among the aerial hyphae, which appear to represent some kind of crystal formation. Typus: South Africa, Western Cape Province, Bettie's Bay, Harold Porter Botanical Garden, on leaves of Protea repens, 4 Jan. 2006, collected by M. Crous & P.W. Crous, CBS-H 19774, holotypus; cultures ex-type CPC 12805 = CBS 120137, CPC 12806-12807; Hermanus, Rotary road on top of mountain, on leaves of P. repens, 31 Dec. 2005, collected by P.W. Crous, CPC 12943-12945. Etymology Named after its collector, Max Crous (age 10), who first spotted this interesting disease. Date entered: 05/06/2006 03:03:34 Entered by: Mycobank administration Illustration #1: Description: Ascospore Author(s): P. Crous Illustration #2: Description: Ascospore Author(s): P. Crous Illustration #3: Description: Crystals in culture Author(s): P. Crous Illustration #4: Description: Crystals in culture Author(s): P. Crous Illustration #5: Description: Crystals in culture Author(s): P. Crous Illustration #6: Description: Germinating ascospore Author(s): P. Crous Illustration #7: Description: Germinating ascospore Author(s): P. Crous Illustration #8: Description: Germinating ascospore Author(s): P. Crous Illustration #9: Description: Hyphae in culture Author(s): P. Crous Illustration #10: Description: Hyphae in culture Author(s): P. Crous Illustration #11: Description: Hyphae in culture Author(s): P. Crous Illustration #12: Description: Colony aspect Author(s): P. Crous Illustration #13: Description: Leaf spot Author(s): P. Crous Illustration #14: Description: Leaf spot Author(s): P. Crous Type specimen Herbarium number: CBS H-19774 Collected by: M. Crous & P.W. Crous, 2006 Substrate: Protea repens, leaves Location: South Africa, Western Cape Province, Bettie's Bay, Harold Porter Botanical Garden