Seynesiopeltis tetraplasandrae
Seynesiopeltis tetraplasandrae F. Stevens & R.W. Ryan, Bulletin of the Bernice P. Bishop Museum, Honolulu, Hawaii 19: 70 (1925).
Index Fungorum number: IF 158371; Facesoffungi number: FoF 06523, Fig. 1
Description:
Epiphytic on upper surface of leaves, causing black spots, solitary or in groups, forming black colonies. Sexual morph: Mycelium superficial, sparse, septate, olive-green. Thyriothecia 350–450 µm diam., 445–595 µm high, solitary or gregarious, superficial, with a circular, shield-like, shallow, narrowed, dome-like, flattened, upper region, carbonaceous, unilocular, brown to black, basal layer not well-developed, ostiole absent. Upper wall comprising radiating parallel cells, cells at margin branching. Hamathecium comprising 1–2.5 µm wide, abundant, cellular, branched pseudoparaphyses. Asci 115–150 × 60–65 µm (x̄ = 130 × 62 µm, n = 20), 8-spored, bitunicate, fissitunicate, saccate, with a knob-like pedicel and conspicuous ocular chamber. Ascospores 35–45 × 13–15 µm (x̄ = 39 × 14 µm, n = 20) irregularly 2–3-seriate, dark brown when mature,uniseptate, strongly constricted at septum, upper cells longer and wider, basal cell shorter and narrower with an acute base, with a thick, structured, hyaline, cell wall. Asexual morph: Unknown.
Material considered: The United States, Hawaii, Oahu, Hamakua, upper ditch trail, on leaves of Tetraplasandra (Araliaceae), 31 May 1921, Stevens F.L. (BISH 1089, holotype).
Fig. 1 Seynesiopeltis tetraplasandrae (BISH 1089, holotype). a Herbarium label. b, c Habit and appearance of thyriothecia on the host surface. d Section through ascoma. e Peridium. f–i Asci. j–n Ascospores. Scale bars: b = 2000 µm, c = 500 µm, d, j–n = 20 µm, e = 30 µm, f–i = 50 µm.
Importance and distribution
Seynesiopeltis comprises only one species known on leaves of Tetraplasandra (Araliaceae) in The United States (Hawaii).
References
Hyde KD, Jones EBG, Liu JK, Ariyawansa H et al. 2013 – Families of Dothideomycetes. Fungal Diversity 63, 1–313.
Inácio CA, Cannon PF. 2008 – The genera of the Parmulariaceae. CBS biodiversity series vol 8. CBS Fungal Biodiversity Centre, Utrecht.
Lumbsch HT, Huhndorf SM. 2010 – Outline of Ascomycota 2009. Myconet 14, 1–64.
Müller E, von Arx JA. 1962 – Beitrage zur Kryptogamenflora der Schweiz 11, 1–922.
Steven FL. 1925 – Hawaiian fungi. Bulletin of the Bernice Bishop Museum 19, 1–189.
von Arx JA, Müller E. 1975 – A re-evaluation of the bitunicate Ascomycetes with keys to families and genera. Studies in Mycology 9, 1–159.
Wu HX, Jaklitsch WM, Voglmayr H, Hyde KD. 2011 – Epitypification, morphology and phylogeny of Tothi fuscella. Mycotaxon 118, 203–211.
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