KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 8. 



17 



Chile: Valparaiso, on rocks exposed to strong surf , near Playa Ancha, young 

 specimens (St. 41, 2. 9. 08). Otlier specimens examined: Orig. Bory, Herb. Agardh 

 no. 26935; Callao, leg. Humboldt, Herb. Agardh no. 26937, ?. 



In Spec. Alg. II p. 380 Agardh puts B. flabellifolia at the end of the genus with 

 the remark: »eaule evidenti haec species a prioribus differt». Howe 1. c. gives an ex- 



Fig. 3. a — C Gracilaria pulvinata: å frond, X 3; b cross section of sterile frond, x 270; C tetrasporangia, X 270. <1 — f 

 Dendrymenia flabellifolia: d — e small plants, X 1 \; f length section of lamina, X 270. 



cellent photograph of a large complete specimen. He regards it as a very distinct species, 

 but his material did not, perhaps, allow him to get a clear idea of the morphology. By 

 an examination of young plants (fig. 3 d — e), the mode of growth is easily explained. 

 The young lamina develops a terete stipe, attached to the rock with a basal disc. Låter, 

 strong hapteres grow out, finally forming a »bird's nest» quite unlike the basal parts 

 in Rhodymenia proper. From the transition zone between stipe and blade a new leaf 

 grows out, becoming differentiated into stipe and lamina. Gradually the new stipe at- 

 tains the thickness of the first one and appears to form a continuation of it; this process 



K. Sv. Vet. Akad. Handl. Band 63. N:o 8. 3 



