Verrucaria ceuthocarpa Wahlenb.
Annotated by R. M. Taylor.

Washington: Skagit County: Southeast part of Washington Park, northwest part of Fidalgo Island.
48° 29' 30" N, 122° 41' 25" W
Coordinate Source: Specimen label.
Habitat: With Enteromorpha just above highest barnacles. Littoral Fringe, exposed to freshwater seepage. Slope: 45 degrees. Aspect: south. Substrate: Serpentine rock. Thallus: 150 micrometers thick. Strongly areolate; areoles 0.3-0.6 millimeters; substrate visible between most. Aeroles bordered by ridgelike juga in some places. Olive-brown to blackish, translucent (especially when wet). Asocarps: 0.2 millimeters across immersed to domelike excipulumm pale throughout. Spores: 8x6 micrometers [drawing]; 10x7 micrometers [drawing]; 10x6 micrometers [drawing]. Substrate: saxicolous.

B. D. Ryan 4165A, Sep 12, 1978
WTU, Barcode: WTU-L-024476