nitidula

Type species:
Roussoella nitidula P.A. Saccardo & G. Paoletti, Atti dell´Istituto Veneto Scienze 6: 387-428 (1888).

Marine species:
Roussoella mangrovei C. Phukhamsakda & K.D. Hyde, Mycosphere 9(2): 339 (2018).

MycoBank: MB554073                                                                                                 Facesoffungi: FoF 03923

Saprobic on dead branches of Rhizophora L., forming raised, dark brown areas with black dots on the host surface. Sexual morph Ascomata 352–476 μm high × 290–400 μm wide (x ̅ = 434 × 340 μm, n=10) diameter, on the surface of the host, solitary, gregarious, erumpent through host surface by papilla, globose to subglobose, coriaceous, ostioles central, black to dark brown, smooth to papillate, ostiolate with periphysoids. Peridium 12–43(–58 at apex) μm wide, multi-layered, outer layer composed of 7–12 layers of dark, brown to light brown cells of textura angularis, the inner layer comprising hyaline thin-walled cells. Hamathecium of dense, 1–1.6 μm (x ̅ =1.3 μm, n=20), filiform, branches, anastomosing, transverse septate, trabeculate psedoparaphyses. Asci 82–115 × 12–19 μm (x ̅ = 117 × 15 μm, n = 20), 8-spored, bitunicate, fisitunicate, broad-cylindrical to clavate, apically round with an ocular chamber. Ascospores 15–20 × 7–11 μm (x ̅ = 16 × 9 μm, n=50), uni-seriate to partial overlapping, oval with round ends, pale-brown to brown, uni-septate, constricted at septum, granulate in each cell well visible when young, rough-walled, surrounded with mucilaginous sheath. Asexual morph: undetermined.
The description was based on Hyde et al. (2018).

Key references:
Hyde KD, Chaiwan N, Norphanphoun C, Boonmee S, Camporesi E, Chethana KWT, Dayarathne MC, de Silva NI, Dissanayake AJ, Ekanayaka AH, Hongsanan S, Huang SK, Jayasiri SC, Jayawardena RS, Jiang HB, Karunarathna A, Lin CG Liu JK, Liu NG, Lu YZ, Luo ZL, Maharachchimbura SSN, Manawasinghe IS, Pem D, Perera RH, Phukhamsakda C, Samarakoon MC, Senwanna C, Shang QJ, Tennakoon DS, Thambugala KM, Tibpromma S, Wanasinghe DN, Xiao YP, Yang J, Zeng XY, Zhang JF, Zhang SN, Bulgakov TS, Bhat DJ, Cheewangkoon R, Goh TK, Jones EBG, Kang JC, Jeewon R, Liu ZY, Lumyong S, Kuo CH, McKenzie EHC, Wen TC, Yan JY, Zhao Q (2018). Mycosphere notes 169–224. Mycosphere 9(2): 271-430.

Saccardo PA, Paoletti G (1888). Mycetes Malacenses. Funghi della penisola di Malacca raccolti nel 1885 dell' Ab. Benedetto Scortechini. Atti dell´Istituto Veneto Scienze 6:387-428.

Dai DQ, Phookamsak R, Wijayawardene NN, Li WJ, Bhat DJ, Xu JC, Taylor JE, Hyde KD, Chukeatirote E (2016). Bambusicolous fungi. Fungal Divers 82:1-105.

Image:
Roussoella mangrovei (MFLU 17-1542, holotype) a Substrate. b Ascomata on Rhizophora sp. c Vertical section of ascoma. d Ostiole filled with periphysoids. e Partial part of peridium. The peridium comprising textura angularis. f Hyaline pseudoparaphyses. g–i Developing stages of asci. j–n Developing ascospores. Scale bars: b = 500 µm, c = 200 µm. The figure was taken from Hyde et al. (2018).

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  Fig 1