Background The oldest reference to marine life in Formigas Islets (oriental group of the Azores archipelago) goes back to the 16th century. Nevertheless, their macroalgal flora is poorly known, the published information mainly resulting from occasional collections of sporadic visitors. To overcome this and contribute to the knowledge of Azorean macroalgal flora at both local and regional scales, a thorough investigation was conducted in 1990 and 1991 under two expeditions promoted by the Marine Biology Research Group of the Department of Biology, University of the Azores. Collections and presence data recordings were undertaken at the littoral and sublittoral levels down to approximately 40 m, in an area of approximately 0.04 km2. This paper lists the taxonomic records and provides information regarding each species’ ecology and occurrence on the Islets’ littoral. New information A total of 320 specimens are registered (including taxa identified only at generic level) belonging to 90 taxa of macroalgae, from which 70 were diagnosed at species level. The confirmed species comprise 39 Rhodophyta, 12 Chlorophyta and 19 Ochrophyta (Phaeophyceae), distributed in 22 orders (13 Rhodophyta, 3 Chlorophyta and 6 Ochrophyta) and 37 families (24 Rhodophyta, 6 Chlorophyta and 7 Ochrophyta). Sixty-one species represent new records for the Islets, from which Botryocladia macaronesica Afonso-Carrillo, Sobrino, Tittley & Neto and Laurencia viridis Gil-Rodriguez & Haroun are Macaronesian endemisms. Most species are native to the Azores, but six have an uncertain origin and four are introduced (the Rhodophyta Asparagopsis armata Harvey; Laurencia dendroidea J.Agardh; Neoizziella divaricata (C.K.Tseng) S.-M.Lin, S.-Y.Yang & Huisman and the Ochrophyta Hydroclathrus tilesii (Endlicher) Santiañez & M.J.Wynne).

中文翻译：

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亚速尔群岛福米加斯岛的海洋藻类植物群

背景 福米加斯群岛（亚速尔群岛的东方群）对海洋生物的最古老参考可以追溯到 16 世纪。然而，它们的大型藻类植物群鲜为人知，公布的信息主要来自偶尔收集的零星游客。为了克服这一点，并有助于在地方和区域尺度上了解亚速尔群岛大型藻类植物群，在亚速尔大学生物系海洋生物学研究小组推动的两次考察下，于 1990 年和 1991 年进行了彻底的调查。收集和存在数据记录在沿海和近海水平进行，低至约 40 m，面积约为 0.04 km2。本文列出了分类记录，并提供了有关每个物种在胰岛沿岸的生态和发生情况的信息。新信息 共登记了 320 个标本（包括仅在一般水平上鉴定的分类群），属于 90 个大型藻类，其中 70 个被诊断为物种水平。已确认的物种包括红藻门39个、绿藻门12个、黄藻门19个（褐藻纲），分布于22目（红藻门13个、绿藻门6个）和37科（红藻门24个、绿藻门6个、黄藻门7个）。61 个物种代表了胰岛的新记录，其中 Botryocladia macaronesica Afonso-Carrillo、Sobrino、Tittley & Neto 和 Laurencia viridis Gil-Rodriguez & Haroun 是 Macaronesian 特有物种。大多数物种原产于亚速尔群岛，