Argopsis 3 without microscopic examination in other herbaria. Argopsis Argus (Hook. f. & Tayl.) Dodge, comb. nov. Stereocaulon Argus Hook. f. & Tayl., London Jour. Bot. 3:653. 1844; Cryptog. Antarct. 84. 1845; Fl. Antarct. : . 184 Argopsis megalospora Th. Fr., Nova Acta R. Soc. Sci. Upsal. III. 2:325. 1858. Type: Campbell Island, on rocks on mountains, J. D. Hooker (Voy. Erebus & Terror in Taylor Herb. at Boston Soc. Nat. Hist. Type of A. megalospora based on a duplicate of this collection in Upsala. The sheet marked "Stereocaulon Argus Tavl." contains four plants glued to the sheet. When they were studied by Müller Argau in 1887, he letter- ed the plants "a" and "b" and annotated the sheet: a. Argopsis megalo- spora Th. Fr.; b. Stereocaulon ramulosum v. macrocarpum Bab. Nyl. The following description is based on the two individuals marked a by Müller Argau. The confusion is not surprising as the specimens resemble each other very closely in macroscopic characters, having the same type of branching and phyllocladia. The primary branches of Argop- sis are somewhat flattened, the cephalodia are much less conspicuous and darker in colour, the exciple is verrucose and the disc tends to remain flatter: all characters which would have been considered trivial in Taylor's time. Taylor, however, mentions all these characters in his description although all his specimens do not show them. Thallus 4-5 cm. tall, branching near the base, closely dichotomous, appearing sympodial, base 2.5 mm in diameter, somewhat flattened and obscurely striate sulcate longitudinally; decorticate, smooth, secondary branches more terete, verrucose, the verrucae passing into short, terete obtuse phyllocladia, cortex dull and peeling off, leaving a slightly tomentose surface; cephalodia not abundant, small, cerebriform, of the Stereocaulon ramulosum type.