Fungalpedia – Note 102, Halodiatrype


Halodiatrype Dayarathne & K.D. Hyde

Citation when using this entry: Perera et al. 2024 (in prep) – Fungalpedia, genera described in 2016. 

Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1

ClassificationDiatrypaceae, Xylariales, Xylariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi

Dayarathne et al. (2016) introduced Halodiatrype with Halodiatrype salinicola as the type. Later, Dayarathne et al. (2020) emended the genus with asexual morphs. Halodiatrype is characterized by the presence or absence of ascostromata or pseudostromata. If ascostromata or pseudostromata are present, they are effused, embedded in decorticated wood, incorporate host tissues, are somewhat eutypoid, and blacken the host surface. Perithecia solitary to scattered, immersed, dark brown to black, globose to subglobose, papillate, and ostiolate with central ostioles. Occasionally, the apex of the ostiole is made up of a brown outer amorphous layer and inner yellow cells of textura porrecta. Ostiolar canal filled with periphyses. Peridium thick and composed of several cell layers of brown to dark cells of the textura angularis. The outer cell layer of the peridium fuses with the host cells. Long unbranched paraphyses arise from the base of the perithecia. They are wide, thin-walled, septate, slightly constricted at the septum, narrowing and tapering towards the apex, with a blunt apex, and smooth to rough-walled with small guttules. Asci are 8-spored, unitunicate and deliquescing initially. They are cylindrical to clavate in shape, with a rounded or flat apex and a pedicel. Apical ring is lacking. Ascospores are arranged in an overlapping uni- to bi-seriate manner and become tri- to tetra-seriate at maturity. They are oblong to allantoid or sub-inaequilateral, slightly curved, aseptate to septate, not constricted at the septum, light brown, with one to a few small guttules, and smooth-walled (Dayarathne et al. 2016). The libertella-like asexual morph on the PDA is a black conidial drop. Conidia are falcate, curved to nearly semicircular, aseptate, hyaline, and smooth-walled. The upper end is subacute while base is truncate (Dayarathne et al. 2020). To date, three species of this genus have been recorded (Dayarathne et al. 2016, 2020). Halodiatrype species are saprobic in marine wood and roots (Dayarathne et al. 2016, 2020).

Type species: Halodiatrype salinicola Dayarathne & K.D. Hyde

Other accepted species: Species Fungorum – search Halodiatrype



Figure 1 – a–e Halodiatrype salinicola (MFLU 15-0179, holotype), f Halodiatrype avicenniae (MFLU 18-0150). a Transverse section of ascoma on the host. b Vertical section through ascoma. c Peridium. d Asci. e Ascospores. f Conidia from culture on PDA. Scale bars: f = 100 μm. a–e: Redrawn from Dayarathne et al. (2016); f: Redrawn from Dayarathne et al. (2020).



Dayarathne MC, Phookamsak R, Hyde KD, Manawasinghe IS et al. 2016 –Halodiatrype, a novel diatrypaceous genus from mangroves with H. salinicola and H. avicenniae spp. nov. Mycosphere 7, 612–627.

Dayarathne MC, Wanasinghe DN, Devadatha B, Abeywickrama P et al. 2020 – Modern taxonomic approaches to identifying diatrypaceous fungi from marine habitats, with a novel genus Halocryptovalsa Dayarathne & KD Hyde, gen. nov. Cryptogamie, Mycologie 41, 21–67.


Entry by

Rekhani Hansika Perera, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand.


(Edited by Kevin D. Hyde, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)


Published online 20 September 2023