Helotiales » Hemiphacidiaceae » Rhabdocline

Rhabdocline weirii

Rhabdocline weirii A.K. Parker & J. Reid, Can. J. Bot. 47: 1540 (1969)

= Rhabdogloeum pseudotsugae Syd., in Sydow & Petrak, Annls mycol. 20(3/4): 215 (1922)

Facesoffungi number: FoF 07573

Parasitic on leaves of Pseudotsuga menziesii. Sexual morph: see Parker and Reid (1969). Asexual morph: Conidiomata 420–550 µm diam., 180–230 µm high, pale ochraceous to orange-yellow, gelatinous amphigenous, pycnidial, solitary to gregarious or confluent, rounded to oval, unilocular, glabrous, thick-walled, dehiscing by a split in the host epidermis which often remains as a flap covering the conidioma, with yellowish conidia mass at lateral zone of conidiomata. Ostiole absent. Conidiomatal wall 10–20 µm wide, composed of thin-walled, hyaline, cells of textura angularis at base. Conidiophores arising from the upper cells of the basal stroma, hyaline, cylindrical, branched, septate, smooth-walled. Conidiogenous cells 5–15 × 2–6 µm, hyaline, enteroblastic, phialidic, cylindrical to ampulliform, discrete or sometimes integrated, smooth-walled, proliferating once or twice. Conidia 11–17 × 3–6 µm (= 13.5 × 5 µm; n = 50), hyaline, cylindrical to ellipsoid, straight or slightly curved, narrowed at middle zone, obtuse or rounded at the apex, truncate at the base, aseptate, smooth-walled, guttulate, bearing a filiform, curved, apical, mucoid appendage 7–18 µm (= 12 µm) long.

 

Material examined: Canada, British Columbia, Langford, on leaves of Pseudotsuga menziesii (Pinaceae), June 1966, A.K. Parker (DAOM 215573).

 

Rhabdocline weirii (asexual morph, DAOM 215573) a, b Herbarium package and specimen. c–f Appearance of orange-yellow conidiomata with yellowish conidial mass on host. g–j Vertical sections of conidiomata. k–o Conidiophores, conidiogenous cells and developing conidia (k, o stained by 10% KOH and India ink). p–t Conidia. Scale bars c = 1000 µm, d–f = 200 µm, g–j = 100 µm, k–t = 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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