Ulva sp.

Dibner, Research Article Skye, Gabrielson, Paul W. & Freshwater, D. Wilson, 2025, Studies of North Carolina marine algae XV. DNA sequencing reveals some different Ulva species compared to historical reports and U. carsoniae sp. nov. (Ulvales, Chlorophyta), Botanica Marina (Warsaw, Poland) 68 (4), pp. 351-374 : 365

3.7 Ulva sp. NC 7 - Ulva ohnoi

Ulva ohnoi (sp. NC 7) was part of the same clade that included U. lactuca and U. lacinulata . It was positioned in a subclade with U. dactylifera , U. lactuca and U. taeniata , but the relationships within this clade were not supported.

Ulva ohnoi was collected at three sites from the mid-to southern coastal areas of North Carolina ( Figure 5 ). The three collected samples of U. ohnoi shared character states for ten of the 25 observed morpho-anatomical characters ( Table 3). They were all narrow blades with obtuse apices, but without hollow or undulating margins ( Figure 7F and G ). Their cells were polygonal in surface view with length-width ratios of 1 – 2 in transection and had 1 – 3 pyrenoids. The three samples were each distinct however in blade shape, presence of dentated margins and basal branching.

Figures

Figure 5: Distribution of eight North Carolina Ulva species among the 52 collection sites in this study.

Figure 7: Variation in morphology of North Carolina Ulva specimens. (A–B) U. tepida: (A) NCweed-2042 sample voucher (WNC-22798), (B) NCweed-2112 sample voucher (WNC-34239). (C–E) U. lactuca: (C) NCweed-2233 sample voucher (WNC-34415), (D) NCweed-2111 sample voucher (WNC-34238), (E) NCweed-2150 sample voucher (WNC-34362). (F–G) U. ohnoi: (F) NCweed-2064 sample voucher (WNC-34196), (G) NCweed-2186 sample voucher (WNC-34316). (H–I) U. lacinulata: (H) NCweed-2200 sample voucher (WNC-34414). (I) NCweed-2111 sample voucher (WNC-34413).