Dianesea Inácio & P.F. Cannon
publication ID |
https://doi.org/ 10.11646/phytotaxa.255.1.6 |
persistent identifier |
https://treatment.plazi.org/id/58389043-8179-CC4E-FF00-FC5F36E6FD5A |
treatment provided by |
Felipe |
scientific name |
Dianesea Inácio & P.F. Cannon |
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Dianesea Inácio & P.F. Cannon View in CoL , Fungal Divers 9: 72 (2002)
Type species: Dianesea palmae (F. Stevens) Inácio & P.F. Cannon View in CoL , Fungal Divers 9: 72 (2002)
≡ Cocconia palmae F. Stevens View in CoL , Illinois Biol. Monogr. 11(2): 175 (1927)
Facesoffungi number: FoF 00561 ( Fig. 4 View FIGURE 4 )
Habitat on unidentified palm. Hemibiotrophic as small leaf spots 4.5 mm long × 2 mm wide, scattered, rarely confluent, amphigenous, as small, ± flat, black, stromatic structures, variable in shape, mostly elliptical, but sometimes circular or irregular, within dark brown to greyish leaf spots, dark brown intracellular hyphae penetrate the plant tissues. Sexual morph: Ascostromata 300–232 μm high × 315–258 μm diam., solitary, wall dark brown to black, superficial, globose to subglobose, with single locule, smooth, coriaceous, ostiolate. Ostiole usually widely porate, broadly papillate. Peridium 46–52 μm, comprising several layers of thick-walled, cells of textura angularis. Hamathecium of numerous, 2–3 μm diam., long, septate, cellular pseudoparaphyses. Asci 90–120 × 18–29 μm (x = 112 × 25 μm), 8-spored, bitunicate, clavate to subcylindrical, with a short, narrow pedicel, thickened and rounded at the apex, with an ocular chamber. Ascospores 21–26 × 5–6 μm (x = 23 × 5 μm), uniseriate to partially overlapping, hyaline to pale olivaceous when immature, dark brown when mature, ellipsoid or cylindrical to clavate, 1-septate, distinctly constricted at the septum, smooth-walled, thick-walled, surrounded by hyaline mucous sheath. Asexual morph: Undetermined.
Material examined:— COSTA RICA. Peralta: on unidentified palm, 13 July 1923, F. L. Stevens 432 ( K, isotype).
Notes:— Genera within the family Phaeosphaeriaceae have thin-walled ascomata that are occasionally aggregated into multi-locular stromata, but are saprobes or necrotrophs and have quite distinct asexual morphs ( Imicio & Cannon 2002, Phookamsak et al. 2014); hence Dianesea could not be placed in this family. In this study, we suggest that Dianesea is morphologically similar to Metameris (family Botryosphaeriacae ), except spore morphology especially the narrow ascospores with hyaline mucous sheath ( Phookamsak et al. 2014). Therefore, the genus might be better accommodated in Botryosphaeriales regarding the similar characters to Metameris . However, we retain this genus in Dothideomycetes, genera incertae sedis until morphology coupled with molecular data can resolve the correct placement of this unusual genus.
F |
Field Museum of Natural History, Botany Department |
L |
Nationaal Herbarium Nederland, Leiden University branch |
K |
Royal Botanic Gardens |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Dianesea Inácio & P.F. Cannon
Jayasiri, Subashini C., Ariyawansa, Hiran A., Jones, E. B. Gareth, Kang, Ji-Chuan, Promputtha, Itthayakorn, Bahkali, Ali H. & Hyde, Kevin D. 2016 |
Cocconia palmae F. Stevens
F. Stevens 1927: 175 |