Navicella Fabre, Annls Sci. Nat., Bot., sér. 6 9: 96 (1879).
Saprobic on dead wood. Sexual morph: Ascomata solitary or scattered, erumpent through the outer layer of the host tissue to nearly superficial, coriaceous. Ostiole usually widely porate, with well-developed neck. Peridium comprising 1–2 layers of thick-walled, textura angularis. Hamathecium of dense long trabeculate pseudoparaphyses, branching, anastomosing between and above the asci, embedded in mucilage. Asci bitunicate, fissitunicate, clavate to sub-cylindrical. Ascospores ellipsoidal with broadly rounded ends, multi-septate. Asexual morph: unknown (Adapted from Ariyawansa et al., 2014).
Type species: Navicella julii Fabre
Notes: Navicella was introduced by Fabre (1879) with N. julii as type species. Navicella is characterized by solitary or scattered ascomata, fissitunicate, clavate to sub-cylindrical asci and ellipsoidal with broadly rounded ends, multi-septate ascospores (Barr, 1990). Holm and Holm (1988) transferred Navicella to Lophiostomataceae based on its saprobic lifestyle. Barr (1990) transferred Navicella to Massariaceae based on morphology namely, the wide endotunica, thin apical ring and distoseptate ascospores, but this classification was not followed by Zhang et al. (2012) and Voglmayr and Jaklitsch (2011). Navicella resembles members of Melanommataceae in having superficial globose to subglobose, coriaceous ascomata with long, trabeculate pseudoparaphyses, embedded in a gelatinous matrix and brown ascospores but can be distinguished in having clavate or cylindrical asci with a long pedicel and ascospores with euseptate primary septum and some taxa have distoseptate hyaline appendages at each end. Some lichenized taxa have been classified under Navicella (Aptroot, 2001, 2003) and need revision as they might belong to other genera. Navicella is morphologically and phylogenetically a distinct genus in Melanommataceae but fresh collections with sequence data is needed to confirm this taxonomic placement.