Hexagonella peleae
Hexagonella peleae F. Stevens & Guba, in Stevens, Bulletin of the Bernice P. Bishop Museum, Honolulu, Hawaii 19: 89 (1925).
Index Fungorum number: IF 253864; Facesoffungi number: FoF 11330, Fig. 1
Description:
Epiphytic on upper surface of leaves. Sexual morph: Ascostromata 295–400 μm diam., 285–395 μm high, scattered, solitary, superficial, with little cuticular connection, dark brown, rounded, plane, cushion-like, glabrous, multi-loculate, with each ascus forming in a locule, appearing ‘cell’ in a network-like structure, comprising a disk, with dense, woven mycelium, the central disk surrounded by irregular periphery of sparsely interwoven, loosely, branched, spreading hyphae, lacking ostioles. Peridium 40–50 μm, composed of a thick, hexagonal, mesh-like structure, with standing hyphae. Asci 12−16 × 14−15 µm (x̄ = 15.1 × 14.3 µm, n = 10), 8-spored, solitary, scattered in hexagonal cell-meshes, not covered by perithecia, each ascus positioned in a space between the sterile cells. Ascospores 10−12 × 5−6 µm (x̄ = 11.2 × 5.2 µm, n = 10), overlapping, brown, ellipsoidal to oblong, 3-septate, constricted at the middle septum, broadest at the lowest cell, thick and smooth-walled. Asexual morph: Unknown.
Note: The specimen was in poor condition. We could not observe any characters from the specimen. We report characters from the micro slide.
Material examined: The United States, Hawaii, Oahu, Wahiawa, on Pelea rotundifolia (Rutaceae), 3 June 1921, FL Stevens (ILL00006017, holotype).
Fig. 1 Hexagonella peleae (ILL00006017, holotype). a, b Herbarium material.
c Appearance of ascostromata on host substrate. d–f Squash mount of ascostromata. g Ascospore. Scale bars: c–f = 50 μm, g = 20 μm.
Importance and distribution
Hexagonella comprises only one species known on leaves of Pelea rotundifolia (Rutaceae) in North America (Hawaiian Islands).
References
Hyde KD, Jones EBG, Liu J-K, Ariyawansa H et al. 2013 – Families of Dothideomycetes. Fungal Diversity 63, 1–313.
Kirk P, Cannon P, Minter D, Stalpers JA. 2008 – Dictionary of the Fungi. 10th edn. CAB International, Wallingford.
Lumbsch HT, Huhndorf SM. 2010 – Outline of Ascomycota 2009. Myconet 14, 1–64.
Phookamsak R, Boonmee S, Norphanphoun C, Wanasinghe DN et al. 2016 – Schizothyriaceae. Mycosphere 7, 154–189.
Stevens FL. 1925 – Hawaiian fungi. Bernice P. Bishop Museum bulletin 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.
Wijayawardene NN, Crous PW, Kirk PM, Hawksworth DL et al. 2014 – Naming and outline of Dothideomycetes–2014 including proposals for the protection or suppression of generic names. Fungal Diversity 69, 1–55.
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