porose

Thallus radiate or dichotomous, the epidermis usually porose.

The cortex is not at all porose or spongy, in color reddish or brown, fragile indeed, but not to the touch, in the herbarium enduring for years.

Epidermis usually more or less distinct and strongly porose above.

Thallus large, forking, areolate, porose, with broad diffused midrib; gemmæ in a cup-shaped receptacle.

Thallus thickened in the middle by a keeled costa, usually conspicuously porose, with dark purple scales beneath; gemmæ none.