3636, Laggan, Alta; 3660 and 3661, Montmorency River, Que.; 7iiy 
Nipigon River, Ont. ; 707, St. Anne’s des Monts River, Que.: 710, Rock- 
Mountains; 708, Kanaskis, Ry. Mts.:7i2, Revelstoke, Ry. Mts. ; 719, Jump, - 
ing Pound Creek, Alta.: 716, Victoria, V. I., J. Macoun; 715, Athabasca 
Rivir. J. M. Macoun; 714, Canaan Forks, N. B., J. Moser. 
The plant here listed is that form of the olivacea group marked by itsdis" 
tinctly rugulose thallus. This and the lack of medullary reaction will serve 
to distinguish. Tuckerman appears to have made no effort to discriminate 
the many forms of affinity with the above established by Nylander, but in 
large series of specimens that author’s differentiations will appear to be well 
founded and reasonable. It may be noted that passage forms between the 
various olivacea species are seldom met with, and each seems to be fairly 
constant to its cited characters. 
P. glabra Schaer. exs. No. 370. 
Reaction Ki, C+ rose. 
Thallus membranaceous, orbicular, loosely attached, bright brown or green- 
ish olivaceous, laciniae more or less transversely rugulose, commonly 
rounded at the apices or slightly crenulate, smooth and even shining; below 
concolorous or blackish and. slightly rhizinose. Apothecia concave or plane, 
concolorous, the exciple slightly crenulate and usually papillate. Spores 
1 V ■■ fx. Not previously listed from America. 
718, on trunks, Ottawa, J. Macoun. 
P. conspurcata (Schaer.) Wain. Notulae de syn. lichenum in Medd. of Soc. 
pro. Faun, et FI. fennica, Feb. 1886. 
P. olivacea a. corticola b. conspurcata Schaer. exs. no. 371. 
Reaction KI, C+ rose, faint. 
Thallus membranaceous, orbicular, appressed but not closely attached, 
olivaceous-brown and opaque, laciniae more or less confusedly rugulose, the 
tips of the lobes rounded and crenate with the upper surface whitish or yel- 
lowish pnnctate-sorediate, these dispersed over the thallus centrally, but 
particularly following the edges of the laciniae; below blackish and rhizinose, 
concolorous at the circumference and glabrous. Apothecia not seen in Ameri- 
can specimens, and no specific description of same is~'available from foreign 
sources. 
On alders. 
732, Cape Breton; 717, Hastings, B. C. ; 44, Blackwater River, B. C.; J. 
Macoun. 
A not uncommon American plant, but only recognized in published lists 
from material determined by Wainio; collected by Dr. Fink in Minnesota. 
P. verruculifera Nyl. in Flora, 1878. 
Reaction KI, C+ rose, me. K (C) -f- rose. 
Thallus much as in the last, but the surface at the centre confluently 
verrucose-granulate or sub-isidiose, the granulations here and there white- 
tipped. Apothecia not known in American specimens. 
On old fences, boards and hemlock bark. 
720, Seymour, W, Ont.; 3306, Sable Is., N. S.; 3502, Algonquin Lake, 
Ont. J. Macoun. 
