Helicangiospora Boonmee, Bhat & K.D. Hyde, gen. nov., Index Fungorum number: IF550574.

Etymology: Helicangiospora, referring to conidial spores produced endogenously within a vessel-like conidiogenous cell.

Saprobic on dead wood. Sexual state:Ascomata superficial, solitary to clustered, scattered, globose to subglobose, dark brown to black, with abundant setae, ostiolate. Setae stiff, tapering to an acute tip at apex. Peridium composed of several outer layer cells of textura angularis, darkened, innermost layer comprising pale brown to hyaline cells of textura subprismatica.Hamathecium comprising ca. 2 µm wide, numerous, filiform, septate, branched,hyaline pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical-clavate or saccate, with rounded apex, pedicellate, ocular chamber not apparent. Ascospores overlapping1–3-seriate, fusiform, hyaline, tapering toward the ends, supramedianly wider, trans-septate, smooth-walled. Asexual state: hyphomycetous, helicosporous. Conidiogenous cells terminal, integrated, holoblastic, globose, occasionally subglobose to oval, golden-brown to olive-brown.Conidiahelicosporous, developing endogenously within conidiogenous cells, released by breaking wall of conidiogenous cell, trans-septate, tapering towards rounded ends, not constricted at septum, coiled once, hyaline, pale brown at maturity.

Type species:Helicangiosporalignicola Boonmee, Bhat & K.D. Hyde

Notes: Phylogenetically Helicangiospora lignicola does not group with any other taxa and is basal to Clades A-B, although lacks support. The genus is also morphologically distinct as it produces a unique helicoma-like asexual state in culture (Fig. 13). The holoblastic conidia are initiated at the tip of a conidiogenous cell by formation of a globose, moderately dark brown cell within which the characteristic helicosporous conidiadifferentiate endogenously. The helicoid conidia are released by schizolytic break down of the outer thick-walled sphaerical capsule. Endogenous differentiation of the conidium is seen in most phialidic type conidiogenesis wherein the conidial primordium is differentiated enteroblastically within the phialide, but in most genera maturation of conidia is exogenous. In asexual genera, such as, Chalara,Fusichalara, Sporoschisma, and Sporoschismopsis, not only differentiation but also maturation of the conidia takes place within the venter of the phialide (Bhat 2010). However, these structures are not similar to what is seen in the asexual state of the present specimen. Therefore, the genus Helicangiospora is established to accommodate this unique species that produceshelicosporous conidia within a conidiogenous capsule.

 Species