24 WILLIAMS: NOTES ON SOME WESTERN LICHENS 
LECIDEA DECIPIENS (Ehrh.) Ach. 
Dawson, on rock, April, 1899 (49). A widely distributed species. 
SPECIMENS FROM MONTANA 
ENDOCARPON TORTUOSUM Herre. 
Near Big Badger Creek, Blackfeet Indian Reservation, Sep- 
tember, 1897 (92). This species was described by Herre in 1911 
from specimens collected near Reno, Nevada. I find no other 
record except these Montana specimens. The genus is peculiar 
in having oblong, muriform, brown spores, mostly two in the as- 
, ‘ ‘ Qo 
cus; in this species measuring about = 
ENDOCARPON PUSILLUM Hedw. 
Heart Butte, September, 1897 (zoo). A much smaller species 
than the preceding, closely adnate to rocks and forming black- 
ish discolorations. Spores similar to, and nearly as large as, 
the preceding, measuring about = p. 
LECIDEA AMYLACEA Ach. 
Henry Mountain, Blackfeet Indian Reservation, August, 1897 
(95). Weseem to have in the museum no specimen of this from 
North America. It is credited to Greenland and to Utah by 
Tuckerman. 
LECIDEA ARMENIACA (DC.) Fr. 
Blackfeet Indian Reservation, August, 1897 (87); fruiting. 
This species has been rarely collected in North America, and not 
before in fruit, I believe. In many respects, the plant is not so 
very unlike Lecanora esculenta of Arabia, which is supposed to 
be the manna of the ancient Jews. The taste is evidently quite 
similar. 
ACAROSPORA RHAGADIOSA (Ach.) Fr. 
On perpendicular walls of sandstone just below the Great Falls 
of the Missouri, February, 1889 (go); in fruit. This appears to 
be the only collection made of this species in North America. It 
seems a well-defined species, known previously only from Europe. 
The determination was by Nylander. 
