1922] Skottsberg: Notes on Pacific Coast Algae 429 



Ruprecht gave a summary of the history of nomenclature in 

 "Tange des Ochotsch. Meeres, " p. 250. When Lamouroux established 

 the genus Delesseria there was an older name for it, Hydrolapatha 

 (-urn) Stackhouse, pp. 54, 67, Tout, marino-crypt. II (1809). Stack- 

 house listed six species, among them H. sanguinea and H. sinuosa. 

 But the name Delesseria continued to be generally used, and this 

 caused the Brussels Congress, 1910, to put it on the list of "genera 

 conservanda" and to reject Hydrolapatha in spite of being older. I 

 think we had better agree to this proposal. D. sanguinea, mentioned 

 first under Delesseria by Lamouroux, should be regarded as the type 

 of the genus. 



In Phycol. Gener. (1843) Kiitzing had established two new genera, 

 Phycodrys, based on D. sinuosa, and Hypoglossum, with H. Wood- 

 wardii (D. hypoglossum) as type. In Sp. Alg. (1849) the same sub- 

 division is retained. Here we need not occupy ourselves further with 

 Kiitzing 's system. Schmitz (Rhodophyceae in Engler and Prantl's 

 Natiirl. Pflanzenfam.) rejected both Phycodrys and Hypoglossum, but 

 at the same time expressed the view that the genus Delesseria ought 

 to become split up, though the time when this might be done in a 

 proper manner had not yet arrived. 



In Sp. Alg. 111:1 (Epicrisis systematis floridearum, 1876) J. G. 

 Agardh divided Delesseria into thirteen sections: Schizoneiira was 

 one of these, characterized by the lamina being "subvage laciniato- 

 partita" and by the tetraspores situated on the main frond between 

 the nerves. Sect. Phycodrys had "frondes sinuato-pinnatifidae " and 

 sori along the costa or in the tips of the segments, or in separate leaf- 

 lets. D. sanguinea, the typical species of the genus, was excluded from 

 the order and brought to the Rhodymeniaceae as a monotypic genus 

 Hydrolapathum. During the whole of his life Agardh firmly adhered 

 to this peculiar idea. In the monograph on the Delesseriaceae, Sp. 

 Alg. 111:3 (1898), the sections of 1876 were given generic rank. The 

 genus Schizoneu^ra is now characterized mainly by the formation of 

 tetrasporangia : the sori are called "gemini" and "oppositi," while 

 they are called "singuli" in other genera, where two sporangia, accord- 

 ing to Agardh, were not formed opposite to each other on the two pages 

 of the frond. This was the case, f . i., in Delesseria in Agardh 's sense : 

 this name is applied to his former section Phycodrys. I cannot see 

 this point of difference, as sections through the sporophylls of D. 

 sinuosa show a bilateral development of the sori just as in Schizoneiira 

 quercifolia. Further, the anatomical structure and mode of growth 



