Anthostomelloides longispora M. Niranjan and V.V. Sarma sp. nov. Figs. 1. a–p
Index fungorum number: IF 558369
Etymology – Epithet with reference to longer ascospores when compared to other species
Saprobic on Cocos nucifera fronds. Teleomorph: Ascomata 400–500 × 420–540 µm, perithecial, scattered, immersed to slightly raised, sub-globose, black, lignicolous, coriaceous, centrally ostiolate, short carbonaceous clypeus, necks are short papillate, brown. Peridium consists of two strata, outer stratum thick, dark brown and inner stratum brown, textura angularis. Hamathecium: paraphyses 3.3 µm wide at base, thin towards apex, septate, branched. Asci 105–153 × 12.5–16 µm (= 127.5 × 14.5, n=25), bitunicate, 8- spored, cylindrical, rarely obclavate or oval, rounded to flat apex with rectracted J+ve apical ring in Lugol’s solution, short pedicellate, persistent. Ascospores 17.5–22.5 × 7.5–8 µm (= 20.78 × 7.5, n=26), hyaline to dark brown, overlapping uniseriate, ellipsoidal, oblong, slightly curved, broadly cylindrical or fusiform, rarely uni-guttulated, smooth walled, surrounded by thin a mucilaginous sheath. Anamorpoh: Undetermined.
Material examined – INDIA, Andaman and Nicobar Islands, South Andaman, Port Blair, (11˚33’46.7”N 92˚43’55.5”E). Recorded on Cocos nucifera fronds. 7 February, 2016, M. Niranjan & V.V. Sarma (PUFNI 357). Additional material examined – South Andaman, Port Blair, Dollygunj, NIOT Coco Plantation (11˚31’21”N 92˚43’8”E) Cocus nucifera (T50F1, T56F2, T57F1, T59F1, T62F1, T65F2, T69F2, T71F1, T72F1, T79F1, T80F1) 07 February, 2016; Middle Andaman, Betapur (12˚9’57”N 92˚46’38”E) on unidentified twig (T38F3) 05 January, 2017; North Andaman, Mohanpur (13˚11’25”N 92˚53’23”E) on unidentified (T156F2) 06 January, 2017; Mohanpur (13˚11’14”N 92˚53’11”E) on Dolichandrone spathacea (T204F2), 17 May, 2018.
Notes – Anthostomelloides was introduced by Tibpromma et al. (2017) to accommodate Anthostommeloides krabiensis and is characterized by immersed, globose ascomagta with a central, papillate, periphysate ostiolar canal, short to reduced black clypeus, asci that are wedge–shaped, with J+ apical rings and ascospores that are oblong–inequilaterally ellipsoidal. Currently Anthostomelloides consists of 5 speceis (Hyde et al. 2020b), this genus differs from Anthostomella in having equilaterally–ellipsoidal ascospores that usually have germ slits (Darangama et al., 2016). Anthostomelloides is closely related to Pseudoanthostomella in having an apical ring that is J + but lacks central periphysate ostilate canals in the ascomata (Daranagama et al. 2016). Within Anthostomelloides, the following species A. forlìcesenica, A. leucospermi and A. brabeji are closely related to A. longispora. A. forlìcesenica distinguishes from A. longispora by having smaller asci and ascospores and a thin mucilaginous sheath (Daranagama et al. 2015). A. brabeji has smaller asci and ascospores that are pale brown, while in A. longispora they are dark brown. A. leucospermi also has smaller asci and ascomata and smaller guttulate ascospores when compared to A. longispora. The Pseudoanthostomella is saprobic on the leaves, submerged to semi–submerged ascomata, cylindrical to clavate asci with a J+ apical rings; ellipsoidal, brown ascospores with a germ slit and a mucilaginous sheath. The proposed taxon fits well in Anthostomelloides due to the presence of a clypeus, periphyses in the ascomata and ascospores without a germ slit and mucilaginous sheath. A. longispora is distinguished by having larger asci and ascospores, and equilateral, non–bilateral or ovoid ascospores. Therefore, based on the morphological differences mentioned above, a new species, A. longispora, is introduced in the genus Anthostomelloides. Daranagama et al. 2016 proposed the key to Anthostomelloides species and in this paper morphological dimentions of each species presented.
Figs. 1. Anthostomelloides longispora (PUFNI 357) a Ascomata b Vertical section of ascoma c Hamathecium d Textura angularis e Paraphyses f–j Asci k–p Ascospores. Scale bars: b = 200 e–j=20 µm c, d, k–p=10 µm.