Pleosporales » Dictyosporiaceae » Pseudocoleophoma

Pseudocoleophoma rusci

Pseudocoleophoma rusci W.J. Li, Camporesi & K.D. Hyde

Index Fungorum number: IF557161, Facesoffungi number: FoF 07537

Etymology: Referring to the host from which it was isolated, Ruscus.

 

Saprobic on dead leaves of Ruscus aculeatus (Asparagaceae). Sexual morph: undetermined. Asexual morph: Conidiomata 130200 µm diam., 250330 µm high, brown, pycnidial, solitary to gregarious, deeply immersed, with only the rostrate neck emerging well above the leaf surface, globose, subglobose or ovoid, unilocular, glabrous, thick-walled, ostiolate. Ostiole 110180 × 6080 µm, flask-shaped, sybcylindrical, obconic, centrally located. Conidiomatal wall 1070 µm wide, composed of relatively thick-walled, brown to dark brown cells of textura angularis in the outer layers, merging with hyaline cells in the inner layers at upper part, comprising thick-walled, hyaline cells of textura prismatica at basal and lateral part. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 49 × 37 µm, hyaline, enteroblastic, phialidic, doliiform, ampulliform to subcylindrical, determinate, smooth-walled, and formed from the inner wall layer of conidiomata. Conidia 8–14 × 36 µm ( = 10 × 4 µm; n = 30), hyaline, cylindrical to subcylindrical or fusiform, with a rounded apex and a slightly narrow truncate base, straight or slightly curved, unicellular, thick- and smooth -walled.

 

Culture characters: Colonies on PDA, reaching 5 mm diam. after 14 d at 25–30°C, pale brown to brown, flattened, dense, with undulate margin, reverse dark brown, with white margins.

 

Material examined: Italy, Province of Forlì-Cesena, Forlì, Farazzano, on dead aerial cladodes of Ruscus aculeatus (Asparagaceae), 11 January 2016, Erio Camporesi, IT2781 (MFLU 16-0292, holotype), living culture MFLUCC 16-1444 = KUMCC 16-0076, (KUN, HKAS 97472, isotype).

 

Notes: In the phylogenetic tree reconstruction based on ITS and LSU sequence data, P. rusci clustered with P. calamagrostidis, P. polygonicola, P. typhicola and P. flavescens with high bootstrap support (99ML/98MP/1BB). In addition, P. rusci formed a separate branch below P. calamagrostidis and P. polygonicola (Fig. 295). Morphologically, P. rusci shares similar characters with the generic type species in having pycnidial, globose conidiomata with long, cylindrical ostioles, phialidic conidiogenous cells and hyaline cylindrical conidia, but it is distinguished from the type species and other Pseudocoleophoma taxa by its conidia dimensions. Pseudocoleophoma rusci has slightly longer and wider conidia than P. calamagrostidis (av. 8.6 × 2.2 μm), shorter and wider conidia than P. polygonicola (av. 14.4 × 3.4 μm), and wider conidia than P. typhicola (av. 10 × 3 μm). Thus, P. rusci is introduced as a new species.

 

Pseudocoleophoma rusci (MFLU 16-0292, holotype) a Herbarium package and specimens. b, c Appearance of brown to dark brown conidiomata on the host. d–f Vertical sections of conidiomata. gi Section of peridium. jm Conidiogenous cells and developing conidia. n Germinating conidium. o Conidia. p, q Culture on PDA . Scale bars b = 500 µm, c = 200 µm, df = 100 µm, g, i , n = 20 µm, h = 50 µm, jm, o = 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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