244 
P. stellaris L. 
P. stellaris {. adscendens Fr. 
P. astrotdea (Fr.) Nyl. 
P. tribacia (Ach.) Tuck. (P. erosa Bort.) 
P. hispida Schreb. (P. tenella Ach.) 
P. crispa (Bers.) Nyl. 
P. caesia (Esch.) Nyl. 
P. obscura (Ehsh.) Ny). 
Var. endochrysea Ny. 
Umpsiuicaria Hoff. 
U. rugifera Nyl. 
U. cylindrica (L.) Del. 
U. proboscidea (L..) Sten. 
U. arctica Ach. (U. proboscidea v. arctica (Ach.) Tuck.) 
U. anthracina (Wulf.) Schr. 
U. polyphylla (L.) Hoff. 
U. flocculosa Hoff. 
U. hyperborea Hoff. 
U. erosa (Web.) Hoff. 
U. Muhlenbergu (Ach.) Tuck. 
U. hirsuta (Ach.) Sten. 
Var. grisea Th. Fr. 
U. vellea (L.) Nyl. 
U. Pennsylvanica Hoff. 
U. spodochroa Ehrh. 
Thallus varying from moderately large and irregular to small 
and orbicular, thin, flattish and spreading, with an irregular 
waving crenate margin in the smaller forms, pale ashy to light 
purplish brown in older specimens, paler at the centre and mealy; 
beneath brown and minutely granulose and thickly covered 
with irregular stout brownish fibrils; apothecia very numerous, 
sessile and scattered towards the border, elevated, stout and robust, 
orbicular, disk prominent, rounded and conspicuously papuloid, 
surrounded by a thick, even or fissured margin, smooth, black; 
spores ellipsoid, simple, 3 mic. 
The occurrence of this Scandinavian lichen in this country is 
rather remarkable. 
U. pustulata (L.) Hoff. 
Var. papulosa Tuck. 
