Botryosphaeriales » Phyllostictaceae » Phyllosticta

Phyllosticta plumbaginicola

Phyllosticta plumbaginicola V.G. Rao, Publicações Inst. Micol. Recife 383: 6 (1963)

Facesoffungi number: FoF 07508

 

Parasitic on the leaves of Plumbago zeylanica (Plumbaginaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 50–100 diam., 55–100 µm high, dark brown to black, pycnidial, solitary to gregarious, subepidermal, deeply immersed, globose, unilocular, glabrous, thick-walled, ostiolate. Ostiole single, circular, centrical. Conidiomatal wall 10–25 µm wide, composed of thick-walled, brown cells of textura globulosa on the exterior, gradually merging with hyaline cells of textura prismatica in inner layers. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 6–12 × 2.5–5 µm, hyaline, enteroblastic, lageniform to subcylindrical, straight or slightly curved, thin- and smooth-walled, percurrently proliferating 1–2 times, formed from the innermost wall layer of conidiomata. Conidia 7.5–11 × 5–7 µm ( = 9 × 6 µm; n = 30), hyaline, oval to ellipsoid, pomiform or subcylindrical to subglobose, with a truncate base bearing minute marginal frills, aseptate, smooth-walled, guttulate, enclosed in a mucoid envelope 1–4 µm wide, bearing appendage at apex; appendage 9.5–16 µm long. single, unbranched, attenuated, mucoid. Spermatia not observed.

 

Material examined: India, Bangalore, Nat. Tuberculosis Inst., on leaving leaves of Plumbago zeylanica (Plumbaginaceae), 24 November 1968, K.M. Ponnappa (DAOM 215565, part of original collection of Phyllostictina plumbaginis).

 

Notes: Phyllosticta plumbaginicola has been reported in India, and is responsible for oval to irregular, straw-coloured leaf spots with tan coloured margins (Nag Raj 1993).

 

Phyllosticta plumbaginicola (DAOM 215565) a, b Herbarium package and specimen. c–e Appearance of black conidiomata on the host. f Vertical section of conidioma. g Section of peridium. h–n Conidiogenous cells and developing conidia (arrows show annellides). o–s Conidia. Scale bars c = 1000 µm, d = 500 µm, e = 100 µm, f = 50 µm, g = 20 µm, h–s = 5 µm.

 

 

 

References:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

 

 

 

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