FLORA OF FORFARSHIRE. 
283 
Isidium, Ach. Isidium. 
Br . sp . and v . 10. F . 3. 
I. Westringii , Ach, Speckled Isidium. H. 231. 
Clova, Mr G. Don. 
I. paradoxum , Ach. Dubious Isidium. H. 231. 
Abundant on the Sidlaw hills, often whitening the rocks. 
I. corallinum , Ach. White Isidium. H. 231. 
Baldovan ; Sidlaw Hills ; Clova, &e., on rocks and walls. 
Sphaerophoron, Ach. Sphaerophoron. 
Br . sp . and v . 3. F . 3. 
S. coralloides , Turn, and Borr. Coral-like Sphseropho- 
ron. H. 232. y. laxum, Hook. 
Walls and rocks frequent, from the coast to the moun- 
tains ; ft. not common, the branches lax, and often tinged 
with a tawny hue. 
/3. ccespitosum , Hook. (S. fragile, Ach.) 
In dense rounded very caespitose masses on rocks upon the 
higher mountains, common ; ft. not uncommon. The branches 
straight, regularly dichotomous, and generally pure white, or 
tinged with a leaden grey. 
S. compressum, Ach. Compressed Sphaerophoron. H. 
232. 
Clova mountains, Mr G. Don. 
Stereocaulon, Ach. Stereocaulon. 
Br . sp . 8. F . 6. 
S. fomentosum, Laur. 
“ Podetia (stems) lax, taper, very much branched, clothed 
with the densest spongy whitish woolliness, scales roundish 
cut and notched, cinereous-caesius, apothecia minute lateral , 
at length globose. 
“ Horizontal thallus none : podetia free at the base, and 
only gently sticking by its wool, which distinguishes it from 
