Nag Raj, T.R. 1982: Genera coelomycetum. XIX. Discosiella, a lichenized mycobiont. Canadian Journal of Botany 59(12): 2519-2533.
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Nag Raj, T.R. 1982: Genera coelomycetum. XIX. Discosiella, a lichenized mycobiont. Canadian Journal of Botany 59(12): 2519-2533.
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Descriptions
Foliicolous. Thalli crustose, scattered to gregarious, occasionally aggregated and confluent, circular or oval, margin deeply lobed, grayish green, ash coloured or grayish white, with the conidiomata appearing as minute black specks disposed mostly in radial lines. Conidiomata pycnidioid, scattered to gregarious, subcuticular in origin, orbicular to oval in outline, dimidiate, hemispherical to subglobose in section, unilocular, glabrous, black with grayish brown central area and a punctiform centre, 90-120 µm in diameter, 50-70 µm deep, ostiolate, with a clypeus covering the hymenium; clypeus 15-25 µm thick, leathery, of "textura epidermoidea" of dark brown to black, thick-walled cells; inner wall membranous, gelatinous, easily separable from the clypeus, of "textura angularis" of hyaline, thin-walled cells; ostiole oval to circular, slightly papillate, 10-15 µm in diameter. Conidiophores reduced to conidiogenous cells, arising in a dense palisade lining the entire cavity of the conidioma. Conidiogenous cells phialides, subcylindrical to lageniform, hyaline, smooth walled, 7-11 x 2-3.5 [mean = 8.7 x 2.8] µm, invested in mucus, often proliferating percurrently one to four times. Conidia blastic-phialidec, didymosporous, subcylindrical to ellipsoidal with a rounded apex and a narrow, obconic, frequently inequilaterally protuberant base, hyaline, smooth walled, wall slightly constricted at the septum, 11-18 x 3-4 [mean = 14.2 x 3.4] µm, initially enclosed in a closely adpressed mucoid sheath that later extends at each end into an ultimately evanescent, but fan-shaped, mucoid appendage; mean conidium body length: width ratio = 4.1:1.
KNOWN DISTRIBUTION: New Zealand.
HABITAT: On leaves of Belschmiedia taraire.
Foliicola. Thalli crustacei, dissiti vel gregarii ad aggregati et interdum confluenti, circulari vel ovali, marginem profunde lobatum, glauci vel argyracei. Conidiomata pycnidioidea, dissita vel gregaria, originem subcuticulari, ambitu orbiculari ad ovate, dimidiata, aspectu sectionali hemisphaerico ad subgloboso, unilocularia, glabra, atra, area centralis brunneola et centro punctiformi, 90-120 µm diam., 50-70 µm alt., osteolata, clypeata; clypeus 15-25 µm cr., coriaceus, e textura epidermoidea ex cellulis crassiparietis et atrobrunneis vel nigris compositus; paries interior membraneaceus, gelatinosus, e clypeo facile separabili, e textura angulari ex cellulis tenui-parietis et hyalinis compositus. Conidiophora cellulis conidiogenis redacta, circa cavitatem conidiomatis ex cellulis pariete interior in vallo conferto enascentia. Cellulae conidiogenae phialides, subcylindraceae ad lageniformes, hyalinae, laeviae, 7-11 x 2-3.5 [mean = 8.7 x 2.8] µm, percurrenter usque ad quater proliferi, in muco involuto. Conidia blastico-phialidica, didymosporacea, subcylindracea ad ellipsoidea, apicibus rotundatis, basibus angustatis, obconicis, saepe asymmetrice protuberantibus, hyalina, laevia, parietes ad septa leniter constrictis, 11-18 x 3-4 [mean = 14.2 x 3.4] µm, primo in vaginam mucosam, autem qui ad maturitatem conidiarum in flabelliformes, postremo evanescentes, mucosas, appendices utrinque extensa. Cellulae microconidiogenae et microconidia non visa.
SPECIMEN EXAMINED: PDD 40205 (Holotype), Kirk's Bush, Papakura, North Is., New Zealand, 20AII.1973, B. Kendrick, KNZ 32 B (in association with a Pestatiopsis sp.).
Cited scientific names
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14 October 2006