— 200 — 



adultiora, observalur in apice fragmentum breve costæ folii præte- 

 riti anni". From this it is clear that Areschoug was of the 

 opinion that the plants lose the laminæ in the autumn and get 

 new ones during the winter. 



In his "Handbok i Skandinaviens Hafsalgflora" I. Fucoideæ, 

 Stockholm 1880 Kjellman writes p. 20 about this matter: „skot- 

 tets bladlika del fälles mot hosten, utvecklingen af det nya sker 

 tidigt på våren". Here a regular shedding of the lamina is very 

 clearly indicated. 



Also in Wille's "Beiträge zur physiologischen Anatomie der 

 Laminariaceen" we read p. 7: "dieses Endblatt fällt jeden Herbst 

 ab und wächst von neuem heraus im Laufe des Winters". 



Finally, Reinke in "Studien zur vergleichenden Entwicklungs- 

 geschichte der Laminariaceen", Kiel 1903 p. 39, writes as follows: 

 "Die Pflanze ist perennierend unter Erneuerung der Spreite aus 

 der Basis heraus, worauf schon Harvey in der Phycol. brit. hin- 

 gewiesen hat. Nach Areschoug stirbt im Herbst die ganze Lamina 

 ab, im Februar oder März wächst eine neue aus dem Ende des 

 Stiels hervor, die an ihrer Spitze noch ein kurzes Fragment der 

 Mittelrippe der Spreite des Vorjahres trägt. In gleichem Sinne äus- 

 sert sich Wille". 



In contradiction to this Phillips so long ago as 1896 in a 

 short "Note on Saccorhiza bulbosa J. G. Ag. and Maria esculenta 

 Grev." (Annals of Botany, Vol. 10, p. 97) mentioned "that an inter- 

 calary growth takes place in Alaria in the same region as in the 

 Laminarias. This appearance however persists throughout the 

 year and I have not seen any evidence of a similar insertion of 

 an entirely new lamina in the spring as occurs in L. digitata and 

 saccharina. The intercalary grow T th in Alaria seems to be conti- 

 nuous; in Laminaria periodic". 



In my treatise on the marine Algæ of the Færoes, (Botany 

 of the Færoes, Part II, 1902), without knowing Mr. Phillips' note, 

 I have maintained the same view regarding this problem. After 

 having quoted the above-named statement by Wille I write: 

 "but I do not think that this is always so, as at any rate along 

 the Færoes I never came across specimens w T hich showed the 

 slightest indication of a regular change of leaves as is the case, 

 e.g. in most of the Laminaria-speties. My own observations 

 lead me to think that the leaf keeps on growing at its 

 base during the greater part of the year, while the 



