Pleosporales » Pleosporales, genus incertae sedis

Spiroplana

Spiroplana Voglmayr, M.J. Park & H.D. Shin, Mycotaxon 116(1): 208 (2011).

Index Fungorum number: IF 519376; Facesoffungi number: FoF 11839, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Mycelium parasitic on leaves, partly superficial, partly endoparasitic. Hyphae septate, branching. Sexual morph: Unknown. Asexual morph: Conidiophores erect, mononematous, septate. Conidiogenous cells terminally integrated, holoblastic. Conidia irregularly globose to elongated, laterally flattened, formed by branched, tightly spirally interwoven, septate conidial filaments; the primary conidial filament giving rise to centripetally growing, coiled daughter filaments at the inner side of the coil (adapted from Voglmayr et al. 2011)

 Type species: Spiroplana centripeta Voglmayr, M.J. Park & H.D.Shin

Notes: Spiroplana is characterised by parasitic mycelium, terminally integrated, holoblastic conidiogenous cells, irregularly globose to elongated conidia. Spiroplana resembles Spirosphaera in having coiled, branched, tightly interwoven conidial filaments with only one daughter filament per filament cell (Hennebert 1998, Voglmayr et al. 2011). Spiroplana differs from Spirosphaera in having reliably centripetal development of the daughter filaments and the laterally flattened conidia which is absent in Spirosphaera. Spiroplana also resembles Clathrosporium in having coiled, branched, tightly interwoven conidial filaments but differs in that the former genus has bilateral branching of its conidial filament, and conidia disarticulating on maturity (Hennebert 1998). Spiroplana also differs from Clathrosporium in ecology since it is a pathogen of living leaves of Philadelphaceae while species of Spirosphaera and Clathrosporium are aquatic saprotrophs (Voglmayr et al. 2011). The taxonomic placement of Spiroplana is uncertain and is currently in Pleosporales genera incertae sedis. Fresh collections and more taxa with DNA sequence data are needed to confirm the placement and familial rank of Spiroplana within Pleosporales. Molecular data available for S. centripeta include ITS and LSU.

 

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