Abdel-Wahab, Hodhod, Bahkali & K.D. Hyde.


Dothideomycetes, Subclass Pleosporomycetidae




incertae sedis


Amarenographium O.E. Erikss., Mycotaxon 15: 199 (1982

Type species:

Amarenographium metableticum (Trail) O.E. Erikss., Mycotaxon 15: 199 (1982)

Marine species:

Amarenographium solium Abdel-Wahab, Hodhod, Bahkali & K.D. Hyde,

Index Fungorum Number: 800681                         Faceoffungi Number: N/A

Saprobic, Asexual morph: Pycnidia 320-400 μm high, 200-250 μm in diameter, subglobose, immersed, brown to black, ostiolate, with circular opening, mature pycnidia forming a black mass of the conidia on the surface of the wood. Peri- dium 62-75 μm thick, comprising two layers, the outer layer 20-25 μm, with brown cells forming a textura epidermoidea and the inner layer 25-37.5 μm with hyaline, flattened, cells forming a textura angularis. Conidiophores absent. Conidiogenous cells 5 × 7.5 μm, ampulliform, hyaline, lining the inner layer of the conidioma, holoblastic, phialidic, producing a single conidium. Conidia 35-50 × 12.5-20 μm (× = 42.5 × 15.7, n = 100), muriform, with (3-) 5 (-7) trans- verse septa and (0-) 1 (-2) longitudinal septa clavate, with apex rounded and basal end acute or truncate, at first yellowish to olivaceous-brown, becoming brown at maturity, constricted at the central septum and slightly at the other septa, smooth with a gelatinous, striated, regular cap and sheath; the sheath is multi-layered in young conidia, swelling and forming fibrillar material in water and eventually dissolving. Single spore isolates of Amarenographium solium growing on CMSA are grey to black with tufts of grey aerial mycelium and deeply immersed black mycelium, one-month old colony are 4-10 mm in diameter. Pycnidia are produced abundantly in pure cultures after 2 months incubation that are immersed with black mass of the conidia produced on the surface of the agar. Pycnidial and conidial dimensions in cultures are similar to those recorded from natural wood. Sexual morph: Undermined.


Key references:

Abdel-Wahab MA, Hodhod MS, Bahkali AH, Hyde KD (2012). Amarenographium solium sp.nov. from Yanbu mangroves in the Kingdom of Saudi Arabia. Cryptogamie Mycologie. 33:285–294.

Eriksson O (1982). Notes on Ascomycetes and Coelomycetes from NW. Europe. Mycotaxon 15: 189–202.

Jones EBG, Suetrong S, Sakayaroj J, Bahkali AH, Abdel-Wahab MA, Boekhout T, Pang KL (2015) Classification of marine Ascomycota, Basidiomycota, Blastocladiomycota and Chytridiomycota. Fungal Diversity 73: 1–72.

Kohlmeyer J, Kohlmeyer E (1979). Marine mycology. The higher fungi. Academic Press, New York, 690 p.


Key to marine Amarenographium species:

1. Conidia 35-50 × 12.5-20 μm, with a sheath, basal appendage absent                                        A. solium

1. Conidia (20-) 27.5-39 × 11-15.5 μm, lacking a sheath, basal appendage present                       A. metableticum

Type & Location:
Other Specimens:
Saudi Arabia, Yanbu, on decayed wood of Avicennia marina at mangrove stand on the Red Sea coast
Saudi Arabia
Pertinent Literature:
Eriksson (1982) introduced the genus Amarenographium based on Camarosporium metableticum as it differed from Camarosporium as it did not possess holoblastic annelidic conidia. He also noted the likelihood that Amarenographium and Amarenomyces (sexual morph) were the same biological species, however, the connection was based on similar morphology with no proven links. Currently two Amarenographium species have been reported from marine habitats A. metableticum and A. solium (Jones et al. 20156). Amarenographium metableticum differs from A. solium in having two polar gelatinous caps and smaller pycnidial and conidial dimensions. Conidiogenesis in A. solium is similar to that found in A. metableticum which is holoblastic and phialidic with solitary conidia (Kohlmeyer & Kohlmeyer 1979).


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