118 The Ottawa Naturalist [Dec. 



The various specimens present a great diversity of colora- 

 tion and conditioning for the thallus. The colors, white, 

 whitish-ash v, ashv to sordid-glaucous, and the thallus from 

 smooth and continuous to verruculose or rugged and more 

 or less rimulose. The spores are variable in size and shape, 

 ranging from 10-26 x 7-14/x, either bilocular with approxi- 

 mate sporoblasts, the cells without nuclei, or more or less 

 nucleolate with a connecting canal visible. In the greater 

 part of the material the thalline margin of the apothecia 

 is perfectly to be made out, and is variously entire or 

 crenulate, but a condition occurs in which the margin is 

 obliterated, and the plant may then be correlated with: 



Lecanora exigua forma lecideoides (Crom.) comb. nov. 



L. exigua var. lecideoides Cromb. Grevillea XVIII, p. 46 



(1889). 

 Apothecia black, convex, and the magrin wholly excluded. 

 Found on willows with the species. 



When found unassociated with the normal forms of the 

 species, the present mav easilv be mistaken for a Lecidea of 

 the section Buellia. The hypothecium is destitute of color, 

 however, and in thin section algae are always to be found in 

 the envelope. 



Lecanora exigua forma pruinosa f. nov. 



Entirelv like the species in thallus, apothecia and spores, 

 and differing only in that the disk of the apothecia becomes 

 gray-pruinose. The pruina does not extend to the exciple. 

 The very dubious Rinodina Hallii Tuck. Synopsis, Pt. I, 

 p. 208, in some of its exhibits is no different from the 

 present. On the same trees with the species. 

 Sidney, Vancouver Island; Prof. J. Macoun. Type in 

 herbarium Merrill. 



Lecanora {Rinodina) colobina Ach. Lien. Univ. p. 358 (1810). 

 Thallus effuse or sub-limited, thin, granulate, the pre- 

 dominent color blackish. Apothecia small (0.05 mm.), 

 adnate, plane, the disk black with a conspicuous thickened 

 entire margin. Spores 8, ellipsoid, bilocular, nucleolate, 

 with a connecting canal, 20-25 x 10-12^, paraphyses distinct. 

 Willows. Sidney, Vancouver Island; Prof. J. Macoun. 

 Previouslv unrecorded from America. 



Phlyctis speirea sp. nov. 



Thallus effuse, tartareous, granulate, cinereo-glaucous, 

 K + red. Apothecia small, difform, erumpent, the thalline 

 margin irregular, lacerate-dehiscent, margin white, nucleus 

 depressed, darker. Spores 2, ellipsoid or oblong-ellipsoid, 

 muriform, hyaline, or yellowish. 100 120 x 25-40^, hymen- 



