[PHYCOLOGY - CROUAN BROTHERS' ALGAE] - CROUAN (Pierre-Louis et Hippolyte-Marie) - Algues marines du Finistère, recueillies et publiées par Crouan frères, pharmaciens à Brest - Brest ; Chez Crouan Frères, Pharmaciens, 1852 - 3 volumes In-8° au complet : Tome I : Fucoïdées - Tome II : Floridées - Tome III : Zoospermées - 404 plates of seaweeds from Finistère mounted on tabs (complete, only the seaweed of plate n°350, Hormotrictum younganum, is missing) - Each plate contains 1 (or more) dried and glued seaweed, with a captioned label with its Latin name, its origin or its growth area, The exceptional work of the Crouan brothers is the result of more than 15 years of methodical harvesting and preparation of samples. Only 50 copies of the work were published and it is currently dispersed throughout the world. Only a few of them are kept in France, including the Muséum national d'histoire naturelle de Paris, the Bibliothèque municipale de Brest, the Université de Bretagne occidentale in Brest, the Station biologique de Concarneau, ... - Very rare copy of this algal herbarium of great patrimonial interest, in a remarkable state of conservation. References : wiki-brest.net/index.php/Fr%C3%A8res_Crouan tresoramu.hypotheses.org/367