Abstract
This study extends our knowledge of the diversity of marine fungi from Saudi Arabia, which is virtually unknown. Thirty-seven fungi (28 ascomycetes, eight asexual fungi, and one basidiomycete) were recorded from 457 samples of driftwood and intertidal decayed wood of Avicennia marina collected from three sites along the Red Sea coast of Saudi Arabia. The three sites include two mangrove sites, namely: Yanbu and Farasan Island, while the third site is a sandy shore nearby Yanbu city. Thirty-one fungi were new records for Saudi Arabia. Swampomyces triseptatus is the only species common to the three sites. The recorded marine fungi were latitudinally distributed with fungi recorded from Yanbu (subtropical site) largely different from those at Farasan Island mangrove (tropical site) with only six common fungi recorded. Amarenographium solium was the most common fungus at Yanbu mangrove, while Lineolata rhizophorae dominated the fungal community at Farasan Island mangrove. Swampomyces armeniacus was commonly recorded at the two mangrove sites. Torpedospora radiata was the most common species recorded from driftwood samples collected at Yanbu beach. A new collection of Diatrypasimilis australiensis enabled us to make a detailed morphological study of the fungus. Mycelia with chlamydospores were isolated from the samples and subsequently sequenced, and they grouped in the Corollospora clade with various degrees of confidence, but did not sporulate on natural material or in culture.