Dasyscyphae on Conifers in North America. IV. Two New Species on Douglas Fir from the Pacific Coast

Abstract

As part of the investigation of the European larch-canker parasite, Dasyscypha Willkonmmii (Hart.) Rehm (2, 5, 6), introduced from Great Britain into Massachusetts, Dasyscyphae on native and planted Douglas fir [Pseudotsuga taxifolia (La M.) Britt.] in North America had to be distinguished. This taxonomic research was necessary because Douglas fir in Europe had been reported attacked by the larch-canker organism (5, p. 900), and Douglas fir in New England was affected by a canker (5, fig. 4) with which a Dasyscypha was associated. It thus became important to determine the relationship of the Dasyscyphae occurring on this economically important conifer. Two species on Douglas fir, the introduced European saprophyte, D. calycina Fuckel (nec Pesiza calycina Schum.) (2), and the native organism, D. Ellisiana (Rehm) Sacc. (3), a species associated with a resinous canker of planted blue Douglas fir along the Atlantic Seaboard (3; 5, pp. 903-904), have already been reported. This paper is concerned with two hitherto undescribed Dasyscypha species restricted in their habitat as far as known to Douglas fir growing on the Pacific Coast.