Pleosporales » Leptosphaeriaceae » Sphaerellopsis

Sphaerellopsis anomala

Sphaerellopsis anomala Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 896 (1993).

Facesoffungi number: FoF 07597

 

Parasitic on Puccinia sp. on Eupatorium sp. (Rosaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 110–210 µm diam., 140–210 µm high, dark brown to black, with yellowish conidial mass at the top of conidiomata, pycnidial, gregarious or confluent, deeply immersed, globose or pyriform, unilocular, thick-walled, glabrous, ostiolate. Ostiole 40–80 µm long, 40–90 µm wide, single, cylindrical, centrally located. Conidiomatal wall 8–30 µm wide, composed of thick-walled, pale brown to hyaline cells of textura angularis to textura prismatica at basal and lateral zone, becoming relatively thick-walled, brown to dark brown cells of textura angularis at upper zone. Conidiophores lining the cavity of the conidiomata, mostly reduced to conidiogenous cells, hyaline, invested in mucus. Conidiogenous cells of two kinds: a) those producing macroconidia, hyaline, enteroblastic, ampulliform to doliiform, subcylindrical or irregular, smooth-walled, 10–14 × 1.5–4 μm ( = 11 × 2.5 μm), with 1–3 percurrent proliferations; b) those producing microconidia, hyaline, ampulliform, smooth-walled, 5–9 × 2.5–6 μm ( = 7 × 4 μm) μm. Macroconidia composed of two kinds, a) Y-shaped or digitate, triradiate, with main axis 7–16 × 3–5 μm ( = 9.5 × 3.5 μm, n = 50), cylindrical to subcylindrical, narrowed and obtuse at the base, broader above, aseptate, bearing two arms 8–21 × 2–4 μm ( = 15 × 3 μm, n = 50), obtuse or sometimes acute at both ends, 2–3-septate, with or without constrictions at the septa, smooth-walled, bearing mucoid appendages at each end or only at one end; b) fusiform to ellipsoidal, 14–23 × 4–5 μm ( = 19 × 4.6 μm, n = 50), with narrow and rounded base, usually 1-septate, constricted at septa, bearing mucoid, apical appendages. Microconidia 5–7 × 2–2.5 μm ( = 6 × 2.2 μm), short-cylindrical to ellipsoidal or subglobose, unicellular, colourless, smooth-walled (measurement of microconidia from Nag Raj 1993).

 

Material examined: Colombia, Bogota, km 36 via Caqueza-Villavicenza, 11 October 1975, Pablo Buritica (DAOM 215300, holotype).

 

Sphaerellopsis anomala (DAOM 215300, holotype) a, b Herbarium specimen. c, d Appearance of dark brown to black conidiomata on the host (d note conidia mass on the top of conidioma). e, f Vertical sections of conidiomata. g Ostiole. h Section of peridium. i–n Conidiophores, conidiogenous cells and developing conidia. o–w Conidia. Scale bars: c = 500 µm, d = 200 µm, e–f, g = 50 µm, h = 20 µm, i = 5 µm, j–w = 10 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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