Anthostomella elipsoidea M. Niranjan.M and V.V. Sarma sp. nov. Figs. 1. a–r
Indexfungorum number : IF558368
Etymology – In reference to presence of ellipsoidal ascospores.
Saprobic on decaying twigs. Teleomorph: Ascostromata strong thick, stromata covering the surface of pseudostromata. Ascomata 420–510 × 380–400 µm, perithecial, subglobose to globose, ostiolated, immersed, single to a group within stroma, clypeate, bipartite. Hamathecium: paraphyses long, septate, un-branched, longer than asci. Asci 80–118 × 4.5–6.2 µm (= 96 × 5.0, n=20), 8-spored, unitunicate, uni-seriate, cylindrical, with a non-amyloid apical ring. Ascospores 7.5–12.5 × 3.7–5 µm ( = 9.7 × 4, n=20), hyaline when young, sub-hyaline to grey at maturity, aseptate, ellipsoid, rounded ends, with a straight germ slit, lacks mucilaginous sheaths. Anamorph: Undetermined.
Material examined – India, Andaman and Nicobar Islands, South Andaman, Ferrargunj, (11˚38’34.2”N 92˚42’23.1”E). Recorded on decaying twigs, 10 August, 2016, M. Niranjan & V.V.Sarma (PUFNI 16335). Additional specimens examined – South Andaman, Port Blair, Chidiya Tapu, Viewpoint (11˚28’50” N 92˚42’38”E) on an unidentified twig (T84F1) 30 May, 2017; Manjery (11°85’91″N 92°73’75″E) on an unidentified twig (T130F1), 08 December, 2017; Port Blair, Chidiya Tapu, Viewpoint (11˚30’48” N 92˚42’36”E) on Diospyros marmarata (T424F2) 20 May, 2018.
Notes − Anthostomella consists of more than 100 species (Wijayawardene et al. 2017). Daranagama et al. (2016) provide a key to other closely related genera. The taxa belonging to Anthostomella have immersed ascomata, cylindrical asci with apical rings, and brown ascospores with a germ slit. A. elipsoidea has thickened stromata associated with host tissues, ascomata immersed in the stromata. The other genera have the following characterstics which separate them from Anthostomella: while Anthostomelloids has oblong-ellipsoidal ascospores lacking germ slits; Pseudoanthostomella has solitary ascomata lacking a central periphysate ostiolar canal; Neoanthostomella lacks apical rings in asci; Alloanthostomella produces only hyaline ascospores (Darangama et al., 2016). Based on the presence of immersed ascomata in a pseudostroma, ellipsoidal ascospores with a straight germ slit the new species is placed in the genus Anthostomella. The present taxon is single celled while many species of Anthostomella have a smaller basal cell. Also, while several species of Anthostomella have mucilaginous sheaths around the ascospores, the present taxon lacks mucilaginous sheaths. The single celled Anthostomella such as A. conorum, A. oblongata, A. helicofissa, A. obesa, (Lu & Hyde 2000; Lee & Crous 2003; Daranagama et al. 2015).
Figs 1. Anthostomella elipsoidea (PUFNI 16335) a, b Ascostromata on twigs c Vertical section of Ascomata d Peridium e Apical thickening f Paraphyses g–k Asci l–r Ascospores. Scale bars c=200µm d=50 µm f, g–k= 20 µm e, l–r=10 µm.