Dothideomycetes » Dothideomycetes, genera incertae sedis » Coccodothis

Coccodothis sphaeroidea

Coccodothis sphaeroidea (Cooke) Theiss. & Syd., Annls mycol. 12(3): 271 (1914)                              Fig. 1, 2

Dothidea sphaeroidea Cooke, Grevillea 7(no. 42): 50 (1878)

Index Fungorum number: IF 153862; Facesoffungi number: FoF 06230

Saprobic or parasitic on living leaves of Juniperus sp. Sexual morph: Ascostromata solitary, superficial to semi-immersed, epiphyllous, rarely hypophyllous, 70–102 µm high × 75–102 µm diam., semiorbicular to pulvinate, black. Peridium 10–17 µm, composed of isodiametric to polyhedric, dark brown, thick-walled cells of textura angularis, presence of 3–4 locules per ascostroma, separated from each other by a wall, 20–30 µm wide, composed of elongated, thick-walled, brown cells. Paraphyses 1–2 µm wide, becoming wider at their apices forming an epithecium, septate, hyaline. Asci 47–54 µm × 23–25 µm (x̅ = 50 × 25 µm, n = 20) bitunicate, fissitunicate, claviform, 8-spored with a distinct ocular chamber. Ascospores 18–20 µm × 8–10 µm (x̅ = 19 × 9 µm, n = 20), bi- to triseriate, 1–septate and constricted in their lower third, at first hyaline and covered by a mucous sheath, becoming brown with maturity, upper cell globose 9–13 µm diam., lower cell nearly globose 7–8 diam., wall smooth to slightly verrucose. Asexual morph: Undetermined. 

Material examined – USA, Georgia, Darien, on living leaves of Juniperus sp. (Cupressaceae), 1993, H. W. Ravenel (S-F51270, isotype).

Economic significance – The genus Coccodothis comprises fungi which are parasitic on Juniperus species (Marmolejo et al. 1997).

 

 

Figure 1 – Section through a stroma of Coccodothis sphaeroidea. (redrawn from Muller & Sanwal 1954)

 

 

Figure 2 – Coccodothis sphaeroidea (S-F51270, isotype). a, b Details of herbarium material. c Appearance of ascomata on host surface. d Section of ascoma e Peridium. f Hamathecium. g–i Asci. j–m Ascospores. Scale bars: c = 500 µm, d = 100 µm, e, g–h = 20 µm, f, j–m = 10 µm.

 

References

Marmolejo JG, Butin H. 1997 – Forest fungi from Nuevo León. A new variety of Coccodothis sphaeroidea from Mexico. Mycological Research 101 (12), 1515–1516.

 

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