[1] All species in the genus have a tropical distribution and are crustose with a chlorococcoid photobiont partner.

[4] Modern molecular phylogenetic analysis has shown its placement in the family Thelenellaceae, allied with the order Ostropales.

[2] Aspidothelium is known for its production of perithecia that range in colour from whitish to pinkish or grey and are uncarbonized.

Within the perithecia, dense and unbranched paraphyses and periphyses can be found alongside clavate asci and colourless ascospores.

Aspidothelium is particularly notable for its unique characteristic of producing fusiform ascospores with numerous transverse septa and short, broad cells.