Cryptosphaeria maris-rubri Abdel-Wahab & E.B.G. Jones, 2025

Abdel-Wahab, Mohamed A., Jones, E. B. Gareth & Bahkali, Ali H., 2025, Two new marine species of Cryptosphaeria (Diatrypaceae, Sordariomycetes) from the Red Sea mangroves, Phytotaxa 696 (4), pp. 276-285 : 281-282

publication ID

https://doi.org/10.11646/phytotaxa.696.4.2

persistent identifier

https://treatment.plazi.org/id/03E287D9-FFBE-771A-FF52-AFD5FBB8FC94

treatment provided by

Felipe

scientific name

Cryptosphaeria maris-rubri Abdel-Wahab & E.B.G. Jones
status

sp. nov.

Cryptosphaeria maris-rubri Abdel-Wahab & E.B.G. Jones sp. nov.

MycoBank MB 857736

Etymology:— From the Latin name “ Mare Rubrum ” meaning “of the Red Sea ”.

Holotype: — EGYPT. Red Sea, Safaga mangrove (26°23’58″N, 34°06’54″E), on decaying intertidal wood of Avicennia marina , 3 November 2020, Coll. M. A. Abdel-Wahab, ( SUMCC H-20010 , holotype). GoogleMaps

Saprobic on decaying intertidal wood of Avicennia marina . Sexual morph: Stromata blackening the wood surface, effuse covering large areas of the wood, up to 8 cm long, ectostroma pseudoparenchymatous, 140–210 µm thick, consisting of polygonal, brown to dark brown cells with thick walls and large lumens that cover the wood surface and the perithecia. Entostroma absent. Ascomata 370–460 μm high, 465–570 μm diameter, globose to subglobose, deeply immersed under ectostroma, with long necks. Ostiole 220–250 µm long, 155–170 µm wide, the tip of the papillae protruding above the wood surface, periphysate. Periphyses 10–15 × 1–2 µm. Peridium 45–57 µm thick, two-layered, forming textura-angularis; outer layer 32–43 µm thick consisting of melanized polygonal cells, brown to dark brown and mixed with host cells; inner layer 10–25 µm thick consisting of flattened cells with narrow lumen and hyaline. Hamathecium composed of numerous, hyaline paraphyses, non-septate, unbranched, persistent, 1–4 μm wide. Asci 48–72 × 6–9 μm (x = 58.6 × 6.8 μm, n = 30), pedicel 18–34 × 2–3.2 μm (x = 23.1 × 2.3 μm, n = 30), 8-spored, unitunicate, clavate, long pedunculated, J- in Lugol’s reagent, persistent, overlapping multiseriate. Ascospores 6–8.4 × 1.6–2.4 μm (x = 7 × 2 μm, n = 50), allantoid, brown, lacking sheath or appendages. Asexual morph: Conidiomata stromatic, multiloculate, 200–320 μm high, 160–225 μm diameter, subglobose, elongate or cleft-like, with a wide opening. Peridium 20–30 μm wide, consisting of parallel hyphae, pale brown. Conidiogenous cells 2–10 × 0.5–1.3 μm (x = 5.1 × 1 μm, n = 15), hyaline, unicellular, cylindrical or possessing a wide base and tapering tip, straight or slightly curved, arising from branched hyphae, producing one conidium, determinate, holoblastic conidiogenesis. Conidia of two types: α-conidia, 3–8 μm in diameter (x = 4.8 μm, n = 50), hyaline, globose, subglobose, clavate, or irregular shapes, surrounded by a gelatinous coat; and β-conidia, 35–57 × 0.8–1.2 μm (x = 48.7 × 1 μm, n = 50), one-celled, filiform, straight, curved, hook-like, or rarely twisted, hyaline to yellowish, appearing apricot in mass, oozing from the ostiole in tendrils.

Notes:— Cryptosphaeria maris-rubri is distinguished from the other five marine species of Cryptosphaeria by its well-developed pseudoparenchymatous ectostroma, which covers the perithecia with papillae penetrating through it. This species has an asexual stage that produces two types of conidia, α and β, as well as smaller ascomata and smaller ascospores than other marine Cryptoshaeria species ( Hyde & Rappaz 1993, Dayarathne et al. 2020). Phylogenetic analyses of the combined datasets of LSU, SSU, and ITS positioned C. maris-rubri alongside C. avicenniae and C. bathurstensis , with moderate bootstrap support (75% ML / 68% MP / 79% BYPP) ( Fig. 1 View FIGURE 1 ).

M

Botanische Staatssammlung München

A

Harvard University - Arnold Arboretum

LSU

Louisiana State University - Herbarium

SSU

Saratov State University

ML

Musee de Lectoure

MP

Mohonk Preserve, Inc.

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