Bilimbia De Not. Giorn. Bot. Ital. 21: 190. 1846.

Thallus usually composed of minute granules, these often run together to
form a leprose or verrucose and rarely areolate or even subsquamulose
crust, rarely disappearing; apothecia minute or small, usually adnate,
with a weak and often covered exciple; hypothecium pale to dark brown;
hymenium pale or tinged brown; spores hyaline, usually fusiform or
dactyloid, varying from 4- to 9-celled.


KEY TO THE SPECIES OF BILIMBIA

On rocks.
Apothecia and spores smaller 5. B. _microcarpa_
Apothecia and spores larger 6. B. _trachona_
On other substrata.
On mosses 2. B. _hypnophila_
On wood or bark.
Spores becoming more than 4-celled 3. B. _naegelii_
Spores not more than 4-celled.
Apothecia flesh-colored to dark brown 1. B. _sphaeroides_
Apothecia black 4. B. _melaena_


1. Bilimbia sphaeroides (Dicks.) Koerb. Syst. Lich. 213. 1855.

Lichen sphaeroides Dicks. Pl. Crypt. Brit. 1: 9. pl. 2. f. 3. 1785.