Abstract
Abstract Based on recent and historical collections dating back to the early 1900s, the seaweed flora in Casco Bay, Maine consists of 206 taxa: 55 Chlorophyta, 70 Phaeophyta, and 81 Rhodophyta. In 1911, Frank Shipley Collins recorded 173 taxa from Casco Bay, while 164 taxa were found during recent sampling since 1994. A comparison of the two time periods shows a 77.7% similarity; some plants have apparently disappeared (or are very rare) and others are newly recorded. Eight newly collected seaweeds represent species that are most common in estuarine and shallow embayments and have southern warm-water affinities (e.g., Hummia onusta, Striaria attenuata, Callithamnion corymbosum, Ceramium cimbricum, Chondria baileyana, Polysiphonia denudata, P. elongata, and Spyridia filamentosa); six others represent introduced taxa, including Codium fragile subsp. tomentosoides, Ulonema rhizophorum, Bonnemaisonia hamifera and its “Trailliella intricata” stage, plus Dumontia contorta, Lomentaria clavellosa, and Porphyra ye...
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