Stromatolinea K. Habib & Q. R. Li 2024, gen. nov.
Creators: name: Habib, Kamran
name: Zhou, Xin
name: Zeng, Wenyu
name: Zhang, Xu
name: Hu, Hongmin
name: Wu, Qianzhen
name: Liu, Lili
name: Lin, Yan
name: Shen, Xiangchun
name: Kang, Jichuan
name: Li, Qirui
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Fungi
Ascomycota
Sordariomycetes
Xylariales
Diatrypaceae
Stromatolinea

description: Stromatolinea K. Habib & Q. R. Li gen. nov.
Etymology.
Referring to linear characteristics of the stromata.
Type species.
Stromatolinea hydei K. Habib & Q. R. Li, sp. nov.
Description.
Saprobic on dead bamboo culms, forming black parallel elongate ascostromata on the host, surrounded by grey or black patches like pseudostromata. Pseudostromata grey or black, spreading between stromata and across the host surface. Sexual morph: Stromata parallel elongate, linear, consistent to inconsistent in thickness, fusiform, high, solitary to confluent, slit to non-slit, black or grey on its sides, exposing black ostioles. Upper cells of stromata near the perithecial ostiole black, thick-walled. Stromatic tissue completely yellow or yellow above and white between / below perithecia, compact. Ascomata perithecial, few to frequent, immersed in stromata, globose to subglobose, ostiolate centrally, with a neck, opening to outer surface, slight erumpent over stromata, appearing as black shinny spots. Peridium composed of elongate cell, texture angularis, outer thick layer, dark brown, inner hyaline, surrounded by yellow or white and yellow stromatic tissue. Hamathecium paraphyses, filiform, hyaline, long. Asci 8 - spored, clavate, with a long and thin pedicel, apically rounded to truncate, J- apical ring. Ascospores allantoid, aseptate, straight to slightly curved, rounded at both ends, subhyaline, with oil droplets in both ends. Asexual morph: undetermined.
Notes.
Phylogenetically, Eutypa is polyphyletic (Fig. 1), a species distributed in different clades. Ma et al. (2023) proposed a new genus, Alloeutypa, which exhibits close affinity to Eutypa. However, based on the presence of Diatrype - like discrete stromata with yellowish-green interior tissue characteristics and forming separate monophyletic clades, they proposed Alloeutypa as a new genus to accommodate Alloeutypa milinensis and A. flavovirens (Ma et al. 2023).
Morphologically, Stromatolinea is similar to Alloeutypa, as both possess yellowish-green interior tissue. However, the new genus is distinguished from Alloeutypa by its linear stromata and phylogenetically, they are clustered very distantly. The strains of Stromatolinea form a monophyletic clade representing its distinct position. Thus, based on morphological evidence and phylogenetic analyses, we accommodate Stromatolinea as a new genus with Stromatolinea hydei designated as the type species.
description: Published as part of Habib, Kamran, Zhou, Xin, Zeng, Wenyu, Zhang, Xu, Hu, Hongmin, Wu, Qianzhen, Liu, Lili, Lin, Yan, Shen, Xiangchun, Kang, Jichuan & Li, Qirui, 2024, Stromatolinea, a new diatrypaceous fungal genus (Ascomycota, Sordariomycetes, Xylariales, Diatrypaceae) from China, pp. 197-225 in MycoKeys 108 on pages 197-225, DOI: 10.3897/mycokeys.108.126712