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Species MB504455 Alternaria thalictrigena K. Schub. & Crous 2007   Non abbreviated authority: K. Schubert & Crous Bibliography: Schubert, K.; Crous, P.W.; Groenewald, J.Z., 2007, Fungal Planet no. 12: [4] (more info) Year of publication: 2007 Status of the name: basionym; legitimate MycoBank's opinion: currently used Classification: Fungi, Anamorphic fungi, Alternaria Obligate synonym(s): none Morphic status: Anamorph (teleomorph connection(s) unknown or not recorded) Taxonomic synonym(s): Ordered by epithet name none Descriptions: Latin diagnosis Differt a A. thalictrina et A. thalictricola conidiis latioribus et longioribus, minute verruculosa vel irregulariter verrucosa, apice non rostrato et non attenuato et a A. chrysanthemi 4-7(-9)-septate. Original description Leaf spots amphigenous, at first punctiform to somewhat irregular, formed mainly at major leaf veins, dark brown, surrounding leaf tissue discolored, turning yellowish, later enlarging and confluent, covering almost the entire leaf surface, dark brown, somewhat paler below. Colonies hypophyllous, scattered, loose, not velvety, with erect conidiophores and many conidia laying on the leaf surface. Mycelium internal, substomatal, subcuticular to intercalary; hyphae sparingly branched, 2-4 µm wide, septate, sometimes slightly constricted at septa, hyaline, smooth, walls unthickened, later becoming wider, up to 12 µm wide, mostly constricted at septa, walls almost unthickened, protoplasm somewhat granular, forming loose aggregations and swollen hyphal cells, up to 16 µm wide. True stromata absent. Conidiophores solitary or in loose groups or fascicles, arising from hyphae or swollen hyphal cells, erect, straight to slightly flexuous, broadly cylindrical-oblong, becoming geniculate due to sympodial proliferation turning terminal loci to one side of the stalk, forming small lateral shoulders, unbranched, occasionally forming short lateral branch-like outgrowth starting points of branching, 35-140 x 7-11 µm, sometimes slightly attenuated or wider within the stalk, up to 13 µm wide, septate, not constricted, septa sometimes becoming sinuous, medium to dark brown, paler towards the base, sometimes also at the ultimate tip, smooth or almost so, walls thickened, about 1 µm thick, base often somewhat wider, up to 10 µm, or slightly swollen, protoplasm often apparently granular, often enteroblastically proliferating near the apex, but not connected with conidiogenesis. Conidiogenous cells integrated, terminal, sometimes intercalary, subcylindrical to cylindrical, sometimes geniculate due to sympodial proliferation, 10-26 µm long, with a single or two loci situated on a broadly obtuse apex or on small lateral shoulders, conidiogenesis monotretic, sometimes polytretic, with a pigmented alternarioid scar. Conidia acropleurogenous, solitary or in short unbranched chains, straight to curved, cylindrical-oblong, at first 65-100 x 12-15 µm, with 4 transverse septa, not constricted or only slightly constricted, pale brown or pale olivaceous, wall approx. 1 µm thick, almost smooth to minutely verruculose, becoming larger, wider, darker and usually distinctly constricted at septa, 65-135 x (10-)12-20 µm, 4-7(-9)-septate, transversal septa becoming sinuous with age, without longitudinal septa, medium to dark brown, verruculose to irregularly verrucose, walls distinctly thickened, up to 2 µm thick, beakless, non-rostrate, often with a bulbous base, apical cell slightly attenuated, narrowly rounded, protoplasm often granular, with a darkened-refractive alternarioid hilum. Culture description Description in culture: Conidiophores on synthetic nutrient-poor agar (SNA) arising laterally from creeping hyphae or terminally from ascending hyphae, slightly to distinctly geniculate, unbranched or once branched, up to 700 µm long, 6-8.5 µm wide, pluriseptate, pale greyish brown to pale medium olivaceous brown. Conidiogenous cells integrated, terminal and intercalary, geniculate, 12-40 µm long, usually with a single locus per cell situated at the somewhat swollen apex or on lateral shoulders. Conidia solitary or in short, unbranched chains, dimorphic; solitary conidia initially narrowly cylindrical, 12-42 x 7-9(-11) µm, 0-2-septate, not constricted at septa or only slightly so, pale grey-brown, larger conidia cylindrical-oblong, 45-90(-120) x 11-21 µm in the broadest part, sometimes swollen and even wider, up to 25 µm wide, median cells usually the widest, 2-6(-7)-septate, slightly to mostly distinctly constricted at the transverse septa, longitudinal septa absent, pale grey-brown to pale medium olivaceous brown, minutely verruculose to irregularly verrucose or rough-walled, ornamentation loose with few longer warts, up to 1(-2) µm long, walls thickened, usually with a bulbous base and a broadly rounded apex, the apical cell often distinctly narrower than the cell below, with more or less parallel cell walls, beakless; second conidium type conidiophore-like with a single apical hilum giving rise to conidia of the first type, narrowly cylindrical-oblong, 20-130(-250) x 6-9(-10) µm, pluriseptate, (0-)3-6(-12)-septate, not or only slightly constricted, concolorous with conidiophores, smooth or only a few parts with verruculose surface ornamentation, forming short, unbranched chains of two or three conidia; conidia of the first type sometimes forming secondary conidiophores. Cultural characteristics: Colonies on 2 % potato-dextrose agar1 (PDA, Difco) pale olivaceous grey to olivaceous grey towards the margin, margin white; floccose aerial mycelium abundant, white, dense, sometimes forming a single concentric zone, growth flat or effuse, exudates not formed. Colonies on potato-carrot agar (PCA) smoky-grey, pale grey, filty, wooly; margin white, undulate; aerial mycelium abundant, white, covering most of the surface, dense, growth flat, regular, numerous small exudates formed but not prominent, slowly growing, sporulating on all media; olivaceous in reverse. Non-original description The two known Alternaria species occurring on species of Thalictrum, A. thalictrina Ondrej described from the Czech Republic and Slovakia and A. thalictricola Y.L. Guo from China introduced by Guo, are morphologically very similar to each other and probably conspecific. However, they are easily distinguishable from our new species by their shorter and narrower smooth, rostrate conidia [40-90(-110) × 8-14(-16) µm in A. thalictrina; 24-85.8 × 10.6-16 µm in A. thalictricola], which are usually distinctly tapered towards the apex and only slightly constricted at septa. Type material of Cercospora thalictri Thüm. was re-examined and transferred to the genus Prathigada Subram., which has passalora-like scars. BLASTn results of the ITS sequence of A. thalictricola had a high identity to sequences of A. dianthi F. Stevens & J.G. Hall (AY154702, 96 % identical), A. radicina Meier, Drechsler & E.D. Eddy (AY154704, 96 % identical) and A. brassicae (Berk.) Sacc. (AY154714, 95 % identical). Although A. thalictricola is morphologically a rather atypical Alternaria, we choose to place it in Alternaria until its generic limits are better understood. Etymology Epithet derived from the host plant, Thalictrum sp. Date entered: 14/12/2006 02:09:34 Entered by: Mycobank administration Illustration #1: Description: Alternaria leaf symptoms Author(s): P.W. Crous Illustration #2: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #3: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #4: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #5: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #6: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #7: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #8: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #9: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #10: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #11: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #12: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #13: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #14: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #15: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #16: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #17: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #18: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #19: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #20: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #21: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #22: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #23: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #24: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #25: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #26: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #27: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Illustration #28: Description: Conidia of Alternaria thalictrigena Author(s): P.W. Crous Type specimen Herbarium number: CBS H-19825 (holotype) Collected by: P.W. Crous, 2006 Substrate: Thalictrum sp., leaves Location: Germany, Baden-Würtemberg, Tübingen, Botanical garden Scientific data 1 link(s) available Associated file click me