S.N. Zhang, Hyde K.D. & Liu J.K. MycoKeys (2019)
Dothideomycetes, Subclass Pleosporomycetidae
Longicorpus S.N.Zhang, K.D.Hyde & J.K.Liu, MycoKeys 49: 117 (2019)
Type and marine species:
Longicorpus striataspora (K.D.Hyde) S.N.Zhang, K.D.Hyde & J.K.Liu. MycoKeys 49: 118 (2019).
≡ Trematosphaeria striataspora K.D.Hyde, Bot J Linean Soc 98(2): 142. (1988).
≡Astrosphaeriella striataspora (K.D.Hyde) K.D.Hyde, Bot J Linean Soc 110(2): 97. (1992).
MycoBank: MB828277 Facesoﬀungi: FoF 05037
Saprobic on mangrove palms. Sexual morph: Ascomata: in vertical section (including short papilla) 300–500 μm high, 230–560 μm diameter, ( = 405.3 × 376.6 μm, n = 15), long neck up to 1285 μm, black, scattered to gregarious, immersed, and erumpent through host epidermis by a papilla or a short to long neck, sometimes visible as a slightly raised, dome-shaped area, with a clypeus comprises host tissue and fungal hyphae, ampulliform, subglobose or conical, uni-loculate, coriaceous to carbonaceous, ostiolate, periphysate, papillate, glabrous or somewhat interwoven pale brown hyphae or setae, lying at apex of the neck. Peridium: 11–15 μm wide, composing of brown to pale brown angular cells, thicker at the rim towards the apex. Hamathecium: comprising up to 1.5 μm wide, septate, branched, filamentous, trabeculate, anastomosing pseudoparaphyses, embedded in a gelatinous matrix. Asci: 85–160 × 10–17 μm ( = 122.7 × 13.7 μm, n = 22), 8-spored, bitunicate, cylindric-clavate, pedicellate, apically rounded, with an ocular chamber. Ascospores: 24–45 × 7–8.8 μm, ( = 34.2 × 7 μm, n = 40), uniseriate to biseriate, hyaline to brown, fusiform, 1–3-septate, the upper middle cell slightly swollen towards the central septate, middle cells larger and longer, end cells paler and smaller, straight or slightly curved, striate, guttulate, surrounded by a mucilaginous sheath. Asexual morph: Undetermined.
Key to species in the genus: N/A
The typical characteristics of L. striataspora are the deeply immersed, carbonaceous ascomata with a long neck, and the striate, guttulate, fusiform, 1–3-septate ascospores, with larger middle cells and relatively smaller and paler end cells, surrounded by a mucilaginous sheath. However, such characteristics are similar to Trematosphaeria spp., and match with Trematosphaeria striataspora (Hyde 1988), the holotype collected from intertidal wood of Nypa fruticans in North Sumatra. Trematosphaeria striataspora was later accommodated in Astrosphaeriella Syd. & P. Syd. (Hyde 1992a) with proposals for recollection and further phylogenetic studies (Liu et al. 2011b, Phookamsak et al. 2015). The fresh collections of Longicorpus striataspora were collected with the type material of Trematosphaeria striataspora, and concluded that the two are identical in morphology. On the other hand, the genus Trematosphaeria Fuckel has been assigned to the family Trematosphaeriaceae K.D. Hyde, Y. Zhang ter, Suetrong & E.B.G. Jones, based on molecular data of its type species T. pertusa Fuckel. Therefore, Ariyawansa et al. (2014) was followed and designated an epitype for Longicorpus striataspora in the study of Zhang et al. (2019).
Zhang SN, Hyde KD, Liu JK (2019) Striatiguttulaceae, a new pleosporalean family to accommodate the genera Longicorpus gen. nov. and Striatiguttula gen. nov., from palms in mangrove ecosystem MycoKeys. 2019.
Hyde KD (1988). Studies on the tropical marine fungi of Brunei. Bot J Linean Soc 98(2): 135-151.
Hyde KD (1992). Fungi from decaying intertidal fronds of Nypa fruticans, including three new genera and four new species. Bot J Linean Soc 110(2): 97.
Liu JK, Phookamsak R, Jones EBG, Zhang Y, Ko-Ko TW, Hu HL, Boonmee S, Doilom M, Chukeatirote E, Bahkali AH, Wang Y, Hyde KD (2011). Astrosphaeriella is polyphyletic, with species in Fissuroma gen. nov., and Neoastrosphaeriella gen. nov. Fungal Divers 51: 135–154.
Phookamsak R, Norphanphoun C, Tanaka K, Dai DQ, Luo ZL, Liu JK, Su HY, Bhat DJ, Bahkali AH, Mortimer PE, Xu JC, Hyde KD (2015). Towards a natural classification of Astrosphaeriella-like species; introducing Astrosphaeriellaceae and Pseudoastrosphaeriellaceae fam. nov. and Astrosphaeriellopsis, gen. nov. Fungal Divers 74: 143–197.
Ariyawansa HA, Hawksworth DL, Hyde KD, Jones EBG, Maharachchikumbura SSN, Manamgoda DS, Tambugala KM, Udayanga D, Camporesi Erio, Daranagama A, Jayawardena R, Liu JK, McKenzie EHC, Phookamsak R, Senanayake IC, Shivas RG, Tian Q, Xu JC (2014). Epitypifcation and neotypifcation: guidelines with appropriate and inappropriate examples. Fungal Divers 69: 57–79.
Longicorpus striataspora (epitype MFLU 18–1580, epi-paratype MFLU 18–1582). a, b. Appearance of ascoma on host surface; c–e. vertical section through an ascoma, with a clypeus near the ostiole; f. ostiole with periphyses; g. apex of the neck, with somewhat interwoven pale brown hyphae or setae; h–k. ascus; l. peridium in vertical section; m. vertical section of the neck, with thicker angular cells; n. pseudoparaphyses; o–r. ascospores; s. ascospore in India ink and presenting a clear mucilaginous sheath; t. germinating ascospore; u, v. Colony on PDA. Scale bars: 500 μm (a), 200 μm (b), 100 μm (c–e), 10 μm (f, l, n–t), 50 μm (g), 20 μm (h–k, m).