Paramphibambusa L.S. Han & D.Q. Dai, 2024

Han, Li-Su, Wijayawardene, Nalin N., Liu, Chao, Han, Li-Hong, Promputtha, Itthayakorn, Li, Qiang, Elgorban, Abdallah M., Al-Rejaie, Salim, Tanaka, Kazuaki & Dai, Dong-Qin, 2024, Paramphibambusa bambusicola gen. et. sp. nov., Arecophila xishuangbannaensis and A. zhaotongensis spp. nov. in Cainiaceae from Yunnan, China, MycoKeys 104, pp. 113-132 : 113

Paramphibambusa L.S. Han & D.Q. Dai gen. nov.

Etymology.

In reference to a new genus is morphologically similar to Amphibambusa , but phylogenetically distinct.

Description.

Saprobic on bamboo culms. Sexual morph: Ascomata deeply immersed beneath poorly developed clypeus, solitary, scattered, black, globose to subglobose, ostiolate, with a long neck. Peridium composed of several layers, thick-walled, hyaline to pale brown cells of textura angularis. Paraphyses hyaline, numerous, filiform to cylindrical, guttulate, branched, septate, tapering towards the apex. Asci 8-spored, rarely 6-spored, unitunicate, cylindrical, short pedicellate, straight or slightly curved, rounded at the apex, with an elliptical to trapezoidal, J+ sub-apical ring. Ascospores uniseriate or overlapping uniseriate, hyaline to golden brown, ellipsoidal, guttulate, 2-3-celled, tapering at the ends, slightly constricted at the septum, smooth-walled, surrounded by a mucilaginous sheath. Asexual morph: Undetermined.

Type species.

Paramphibambusa bambusicola L.S. Han & D.Q. Dai

Notes.

A monotypic genus Paramphibambusa is introduced based on its different morphological characteristics and the support of phylogenetic affinity with the other members in Cainiaceae . The morphological characteristics of Paramphibambusa resemble Amphibambusa in having dark clypeus, immersed, globose to subglobose ascomata, unitunicate, short pedicellate asci with a J+, and sub-apical ring, and 1-septate ascospores, surrounded by a thick mucilaginous sheath ( Liu et al. 2015; Jiang et al. 2021). Paramphibambusa can be easily distinguished from Amphibambusa in having an ostiole, with a long neck, and ascospores lacking longitudinal wall ornamentations. In addition, Paramphibambusa forms a well-separated branch basal to other cainiaceous genera with 90% ML, and 1.00 PP statistical supports (Fig. 1 ). Paramphibambusa differs from the sexual members of Cainiaceae in ascomata with a long neck leading up to the ostiole, and in that the ascospores lack longitudinal striations or germ slits or germ pores Endocalyx is an asexually typified genus and lacks a sexual morph to compare its morphology with Paramphibambusa . However, in the phylogenetic analyses, Paramphibambusa resides in a distinct phylogenetic lineage to Endocalyx (Fig. 1 ). Therefore, we consider Paramphibambusa as a distinct genus.

Figures

Figure 1. The RAxML tree was generated based on the combined ITS, LSU, rpb 2, and tub sequence data. Bootstrap support values for ML equal to or greater than 60 %, and Bayesian posterior probabilities (BYPP) equal to or higher than 0.90 are indicated above the nodes as ML / PP. Type materials are indicated by superscript " T ", while the newly generated sequences are shown in red.