Longicorpus striataspora (K.D.Hyde) S.N.Zhang, K.D.Hyde & J.K.Liu, comb. nov.

Zhang, Sheng-Nan, D. Hyde, Kevin, Gareth Jones, E. B., Jeewon, Rajesh, Cheewangkoon, Ratchadawan & Liu, Jian-Kui, 2019, Striatiguttulaceae, a new pleosporalean family to accommodate Longicorpus and Striatiguttula gen. nov. from palms, MycoKeys 49, pp. 99-129 : 113-114

Longicorpus striataspora (K.D.Hyde) S.N.Zhang, K.D.Hyde & J.K.Liu, comb. nov. Figure 5

Trematosphaeria striataspora K.D.Hyde, Botanical Journal of the Linnean Society 98(2): 142. 1988.

Astrosphaeriella striataspora (K.D.Hyde) K.D.Hyde, Botanical Journal of the Linnean Society 110(2): 97. 1992. Type: North Sumatra. K.D.Hyde (holotype: IMI 312390).

Epitype.

THAILAND. Ranong: Ranong, on decayed rachis of Nypa fruticans Wurmb ( Arecaceae ), 6 December 2016, S.N. Zhang, SNT93 (epitype designated here: MFLU 18-1580; epi-isotype designated here: HKAS 97479; ex-epitype living culture MFLUCC 18-0267 = GZCC 18-0009).

Description.

Saprobic on mangrove palms. Sexual morph: Ascomata in vertical section (including short papilla) 300-500 µm high, 230-560 µm diameter, (x̄ = 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 (x̄ = 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, (x̄ = 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.

Culture characteristics.

Colonies on PDA attaining 12 mm diameter within 21 days at 25 °C under natural light, velvety, centrally raised, irregular to circular in shape, greenish grey and mixed with milky white mycelium at the edge of a colony, the reverse dull green or grey olivaceous.

Additional specimens examined.

Thailand. Chanthaburi, 12°26'43"N, 102°15'47"E, on rachis of Phoenix paludosa Roxb. ( Arecaceae ), immersed mangrove mud and water, 25 April 2017, S.N.Zhang, SNT130 (epi-paratype MFLU 18-1581; living culture MFLUCC 18-0268 = GZCC 18-0010); Thailand. Krabi, near Pali, on decayed rachis of Nypa fruticans Wurmb ( Arecaceae ), immersed mangrove mud and water, 30 August 2017, S.N.Zhang, SNT195 (epi-paratype MFLU 18-1582; living culture MFLUCC 17-2515 = GZCC 18-0011; MFLUCC 17-2516 = GZCC 18-0012).

Habitat and distribution.

Inhabiting in Thai mangrove forests, the Andaman sea (west) coastline and the Gulf of Thailand (east).

Notes.

Longicorpus striataspora was found on two mangrove palm species, Nypa fruticans and Phoenix paludosa . 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. (Table 3), 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). We have compared the fresh collections of Longicorpus striataspora 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, we follow Ariyawansa et al. (2014) and designate an epitype for Longicorpus striataspora in this study.