Architrypethelium hyalinum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae.

[1] Found in Costa Rica and Brazil, it was formally described as a new species in 2008 by lichenologist André Aptroot.

[2] The type specimen was collected by Harrie Sipman from the Las Cruces Biological Station in Puntarenas.

Its ascomata occur solitarily, have an apical ostiole, and measure 0.7–1.5 mm in diameter.

Ascospores number 4 to 8 per ascus, have an oblong to ellipsoid shape with 3 septa, and measure 100–150 by 30–50 μm.