Fungalpedia – Note 2848, Ejnerjensenia
Ejnerjensenia. W.P. Wu & Y.Z. Diao.
Citation when using this data: Wenping W et al. 2022 – Fungalpedia.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Chaetosphaeriaceae, Chaetosphaeriales, Sordariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Etymology: Named after the former Vice President Ejner B. Jensen from Novozymes, who made significant contribution to industrial biotechnology and gave strong encouragement for this mycological research during last 25 years.
Diagnosis: Ascospore hyaline, cylindrical, uniseptate. Conidiophore cylindrical, dark brown, septate, terminated with a monophialidic conidiogenous cell bearing a cup-shaped collarettes; Conidia hyaline, aseptate, short cuneate or dacryoid.
Teleomorph: Perthecia often densely aggregated, with or without a thin, black, basal pseudostroma. Perthecia black, brittle, subglobose, ostiole conical, smooth-walled, glossy; wall consisting of several layers of strongly compressed, pigmented cells of textura epidermoidea. Asci thin-walled, narrow cylindrical. Paraphyses emerging between the asci. Ascospore mostly somewhat obliquely monostichous, chromophilic, cylindrical, with rounded ends, 1-septate, hyaline, smooth-walled. Anamorph: Setae absent. Conidiophore solitary, simple, cylindrical, erect, straight or flexuous, septate, brown to dark brown, smooth-walled, terminated with a conidiogenous cell, proliferating percurrently. Conidiogenous cells integrated, terminal, monophialidic, brown, becoming paler towards the apex, smooth; collarette flaring or funnel-shaped or cup-shaped. Conidia produced singly within the collarette and aggregated in a slimy masses or regular chain, typically short-cuneate or dacryoid with a truncate base and rounded or flatten apex, smooth-walled, aseptate, hyaline (Adapted from Constantinescu et al. 1995).
Ecology/Substrate/Host: Saprobes on dead material of plant.
Geographical distribution: Broadly distributed in worldwide.
Notes: The new genus Ejnerjensenia is created for Chaetosphaeria myriocarpa and its anamorphic state Chloridium clavaeforme In the phylogenetic tree forms a strongly supported linkage distinct from the type species of Chaetosphaeria (C. innumera) and other genera in Chaetosphaeriaceae species. Morphologically it differs from other related genera by 1-sepate ascospore, monophialidic conidiogenous cells with percurrent proliferation and flaring or funnel-shaped or cup–shaped collarettes, and hyaline aseptate, shortcuneate or dacryoid conidia in slimy head and with a truncate base and rounded or flatten apex (Gams and Holubová-Jechová 1976).
In the phylogenetic analysis, Ejnerjensenia myriocarpa is grouped together with two other Chaetosphaeria species, C. pygmaea and C. guttulata. Chaetosphaeria pygmaea also produces one-septate ascospore, and Chloridium-like anamorph with flask-shaped conidiogenous cells bearing cup-shaped collarettes, and dacryoid conidia in chain and with a truncate base and rounded apex and formed, which is very similar to E. myriocarpa (Constantinescu et al. 1995). While Chaetosphaeria guttulata was created for an anamorphic fungus characterized by dark brown and septate conidiophore with a terminal holoblastic and polyblastic conidiogenous cell bearing numerous tiny protuberant conidiogenous loci, and hyaline ovoid or fusiform, 3-sepate conidia (Luo et al. 2019)
Type species: Ejnerjensenia myriocarpa (Fr.) W.P. Wu & Y.Z. Diao, Fungal Diversity 116: 278 (2022).
Other accepted species: Species Fungorum – search Ejnerjensenia.
Figure 1 – Ejnerjensenia myriocarpa (= Chloridium clavaeforme, Wu15226). a, f, g, j Conidiophores and conidiogenous cells with funnel-shaped collarette. b–e, h, i Conidia. Scale bar: 5 μm.
References
Entry by
Wenping Wu, R&D Center, Novozymes China, No. 14 Xin Xi Lu, Shangdi Zone, Haidian District, Beijing 100085, People’s Republic of China
Published online 3 August 2026