Two red macroalgae newly introduced into New Zealand: Pachymeniopsis lanceolata (K. Okamura) Y. Yamada ex S. Kawabata and Fushitsunagia catenata Filloramo et G. W. Saunders Author D’Archino, Roberta Author Zuccarello, Giuseppe C. text Botanica Marina 2021 Warsaw, Poland 2021-03-31 64 2 129 138 http://dx.doi.org/10.1515/bot-2021-0013 journal article 10.1515/bot-2021-0013 1437-4323 11000093 3.2.1 Pachymeniopsis lanceolata ( Figures 3–16 ) Thalli ( Figures 3–10 ) were flattened, 14–35 (60) cm high and 6–15 cm wide, and attached by a discoid holdfast, from which a short ( Figures 5–6, 9–10 ) or nearly non-existent stipe arose ( Figures 3 and 4 ). Thalli were solitary ( Figures 4 and 5 ) or clustered ( Figure 8 ), the blades were broadly lanceolate ( Figures 3, 4 , and 6) or irregularly divided ( Figures 6–8 ). Old thalli became proliferous ( Figures 8 and 10 ). Thalli were purplish-red to brownish, with a membranous texture that became leathery in old plants. Large thalli had a strong chlorine smell. Blades were 200– 600 µm thick ( Figures 11 and 12 ), reaching up to 1 mm in thickness in old specimens. The cortex consisted of anticlinal filaments (6) 8–12 cells long, the cells becoming progressively smaller toward the surface layer of elongate cells ( Figure 12 ). The medulla was composed of sparsely to densely compacted filaments, 2–7 µm in diameter ( Figures 11 and 12 ). Male gametophytes were found in winter, whereas cystocarps and tetrasporophytes were seen in summer. Tetrasporangia ( Figure 13 ) were scattered over the blade (30–53 × 15–21 µm) and were cruciately divided. The carpogonial branch ampullae were monocarpogonial ( Figure 14 ), 45–57 × 29–40 µm. The auxiliary cell ampullae ( Figure 15 ) were 40–46 µm in length and 30–36 µm in width. The auxiliary cell was intercalary in one of the ampullar filaments and had 12 × 7 µm dimensions. Cystocarps ( Figure 16 ) were 100–220 µm in diameter, immersed in the blades and surrounded by a rudimentary pericarp of lax ampullar filaments. The carposporophytes consisted of three synchronously maturing lobes and contained irregularly angular carpospores (15–22 × 10–13 µm).