Asa Gray's Scalewort is usually found on trees where it grows tight against the bark. The plants are only about 1-2 mm wide but may grow to several centimeters in length. The leaves are dark green to reddish-brown or nearly black. Microscopy is necessary to distinguish Asa Gray's Scalewort from other species of Frullania. The leaves of Asa Gray's Scalewort have distinctive cells called ocelli.
Asa Gray's Scalewort is most conspicuous on trees with gray bark like red maple, beech, holly and some oaks.
There are 16 records in the project database.
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