Sporoschisma longicatenatum J. Yang, J.K. Liu & K.D. Hyde, 2016

Yang, Jing, Liu, Jian-Kui, Hyde, Kevin D., Bhat, D. Jayarama, Jones, E. B. Gareth & Liu, Zuo-Yi, 2016, New species of Sporoschisma (Chaetosphaeriaceae) from aquatic habitats in Thailand, Phytotaxa 289 (2), pp. 147-157 : 152-155

Sporoschisma longicatenatum J. Yang, J.K. Liu & K.D. Hyde , sp. nov. Fig. 4

Index Fungorum Number : IF552182, Facesoffungi Number: FoF 02243.

Etymology: —Referring to the long chains of conidia. Holotype: —MFLU16-1325.

Saprobic on decaying plant substrates. Asexual morph: Colonies effuse, black, hairy, with long chains of conidia. Mycelium immersed, composed of pale to dark brown hyphae. Setae scattered or in groups mixed with conidiophores, capitate, usually surrounded by hyaline mucilage at the swollen apex, smooth, pale to medium brown, paler towards the subhyaline apex, straight or flexuous, 2−3-septate, 95−185 × 4.5–6.5 μm, 6–8.5 μm wide at the swollen apex. Conidiophores macronematous, mononematous, smooth, dark brown to black, paler at the torn apex, straight or slightly flexuous, solitary or in groups of 2−3 with 0−4 setae, arising from dark brown to black bulbous base, composed of a cylindrical stipe and a swollen venter with a long cylindrical neck, erect, sometimes proliferating percurrently, 245–335 μm long, 7.5–12 μm wide below venter and 11–16.5 μm wide above, 15–22 μm wide at venter. Conidiogenous cells monophialidic, percurrent, integrated, terminal, determinate, brown, lageniform, frayed at the apex. Conidia cylindrical to doliiform, 35–45.5 × 9–11 μm (x = 40 × 10 μm, n = 35), 1−5-euseptate, hyaline when young, olivaceous to brown at maturity, with hyaline to pale brown end cells, which are much shorter than the four inner cells, conspicuously darkened at the septa, rounded at both ends. Sexual morph: Undetermined.

Culture characters: —Conidia germinating on PDA within 24 h and germ tubes produced from both ends. Colonies on MEA reaching 5–10 mm diam. at 7 days, with fluffy, dense, white mycelium in the center, becoming sparse and hyaline at the smooth edge; in reverse with a yellowish middle, paler towards the smooth margin.

Habitat and distribution: —On submerged wood in freshwater, Thailand.

Material examined: — THAILAND, Prachuap Khiri Khan Province: Hua Hin, stream outside Kaeng Krachan National Park , on submerged wood, 25 December 2014, Jaap van Strien, Site 5-14-3 ( MFLU16-1325 holotype; HKAS95044 isotype) ; ex-type living culture, MFLUCC16-0180 , GZCC15-0072 .

Notes: —Phylogenetic analysis showed that Sporoschisma longicatenatum is close to S. hemipsila . Morphological comparison demonstrated that they share similar morphological characters. The conidia ends of S. longicatenatum are rounded, while they are subtruncate in S. hemipsila . In addition, percurrent proliferations of conidophores were observed in S. longicatenatum .

Figures

FIGURE 4. Sporoschisma longicatenatum (MFLU16-1325, holotype) a. Colony on wood. b. Conidiophores showing percurrent proliferation. c. Conidiophores and setae. d, e. Conidia and conidiophores. f. Portion of phialide producing conidium. g−m. Conidia. n. Germinating conidium. o, p. Culture on MEA, o from above, p from below. Scale bars: a = 200 μm, b−e = 100 μm, f, g = 50 μm, h−n = 20 μm.