517. O. varia, (Pers.) Fr.
518. O. vulgata, Ach.
On bark of conifers, Half Way Point, Newfoundland. (Waghorne.) On bark of Alnus rubra, by the sea, at Comox, Vancouver Island, June 20th 1893; on ash bark near the Rideau River, at the Hogsback, near Ottawa, Ont., and at Leamy's Lake, near Hull, Que., May 7th, 1897. (Macoun)
519. O. zonata, Koerb.
On rocks, Lark Harbour, Newfoundland. (Waghorns.)
520. O. atra, Ach.
Labrador or Newfoundland. (Waghornefide Eckfeldt.)
521. O. saxicola, Ach.
On sandstone rocks, Goose Arm, Newfoundland. (Waghorne.)