The holotype of Lecanora imshaugii Brodo is identical to L. perflexuosa (Rds.) Miyawaki of Japan and Korea, with the name L. imshaugii taking priority. This is another example of a lichen species restricted to an eastern North American and eastern Asian distribution pattern. The affinities of the Japanese macrolichen flora with that of eastern North America have been discussed repeatedly, especially by Ahti (1961), Kurokawa (1972), and Yoshimura (1968, 1987) (Table 1). Although a few crustose lichens have been reported to be examples of such a disjunction, e.g., Haematomma ochrophaeum (Tuck.) Massal. [= Loxospora ochrophaea (Tuck.) R. Harris in Egan] by W. Culberson (1963), Lecanora subimmergens Vainio by Brodo (1984), and Ochrolechia trochophora (Vainio) Oshio and 0. yasudae Vainio by Brodo (1991), phytogeographic studies of crustose lichens are still uncommon, and examples of eastern American-eastern Asian distributions are rarely cited. In addition to morphological study, the secondary metabolites (lichen substances) ofL. imshaugii were investigated with thin layer chromatography using the techniques described by Brodo (1984), C. Culberson (1972), and C. Culberson and Johnson (1982). Brodo (1984) distinguished L. imshaugii from related species by its indistinct to absent amphithecial cortex and by its nongranular, noninspersed epihymenium. Miyawaki (1988) reported two Japanese species similar to L. imshaugii-L. megalocheila (Hue) Miyawaki and L. perflexuosa (Riis.) Miyawaki-which also have indistinct to absent amphithecial cortex. The epihymenium of L. megalocheila has fine granules on the surface and between paraphyses tips, whereas L. perflexuosa has a nongranular epihymenium. According to Brodo (1984) the spores of L. imshaugii are 10.0-13.5 x 6.08.0(-9.0) Am, and thus should be smaller than those of L. perflexuosa (12-17 x 5-7 Am). Recently I had a chance to examine the type specimen ofL. imshaugii. According to my observation, the spore size has rather wide variation [10.0-17.5 x 5.0-8.0(-13.5) Am], thus overlapping the size range of spores in L. perflexuosa. The two species are identical in chemistry, both containing atranorin, zeorin, and hypoprotocetraric acid. There thus seems to be no way of separating the two taxa, and the two names should be regarded as synonyms. LECANORA IMSHAUGII Brodo, Beih. Nova Hedwigia 79: 137. 1984. (FIG. 1) TYPE: CANADA. ONTARIO. Ottawa (Rockcliffe, Pine Hill), on a pine trunk, Macoun 345, 16 April 1896, holotype in CANL. TABLE 1. List of lichens recorded only from eastern North America and eastern Asia. Anaptychia palmulata (Michx.) Vain. Kurokawa (1962) Anaptychia hypoleuca (Miihl.) Mass. Kurokawa (1962) Anzia ornata (Zahlbr.) Asah. Culberson, W. (1961) Candelariafibrosa (Fr.) Mfill. Arg. Culberson, W. (1972) Cladonia clavulifera Vain. Yoshimura (1968) Cladonia submitis Evans Ahti (1961) Lecanora subimmergens Vain. Brodo (1984) Lobaria quercizans Michaux Culberson, W. (1972) Haematomma ochrophaeum (Tuck.) Mass. Culberson, W. (1963) Ochrolechia trochophora (Vainio) Oshio Brodo (1991) Ochrolechia yasudae Vainio Brodo (1991) Parmelina galbina Ach. Kurokawa (1968) Parmelina metarevoluta (Asah.) Hale Hale (1976) Phaeophyscia rubropulchra (Degel.) Essl. Kashiwadani (1984) Stereocaulon depreaultii Delise ex Nyl. Asahina (1965) Stereocaulon tennesseense Magn. Asahina (1961) Usnea mutabilis Stirton Asahina (1961) 0007-2745/94/409-411 0.45/0 This content downloaded from 157.55.39.127 on Mon, 27 Jun 2016 05:25:59 UTC All use subject to http://about.jstor.org/terms 410 THE BRYOLOGIST [VOL. 97