OP ARTS AND SCIENCES. 



209 



New England coast answer perfectly to this description of Phi/Uaria 

 lorea. Only a very few were found which would at all agree with the 

 description of Ph. derinatodea, and these few always seemed to he 

 the product of unfavorable circumstances which had dwarfed them. 

 The shapes too of the young specimens figured in the "Arctic Alg;c"* 

 agree very well with numerous specimens collected at Nahant. Kjell- 

 mau further says, that " older specimens of the two species are easily 

 distinguished from each other by several good characteristics. In Ph. 

 lorea the stipe collapses in drying, and becomes flat, thin, almost 

 membranaceous, and brittle ; even in vevy large specimens, it has the 

 same color as the lamina, being pellucid like this, lu older specimens 

 of Ph. dermaiodea the stipe is far more solidly built, dark brown, 

 0[)!ique, flat upwards, but almost terete downwards. "f Of my New 

 England specimens, very large ones, in fact many of the very largest, 

 answer almost exactly to this description of Phyllaria lorea. When 

 dried, both stipe and blade become very thin and membranaceous, and 

 extremely brittle. The stipe is light yellow-brown still in many cases, 

 and the cryptostomata are very numerous and long-haired. In such 

 specimens, too, the tubular cells are thin-walled, and with a very wide 

 lumen. It is not until very late that these plants have cryptostomata 

 with a prominent overhanging margin. They have all the characters, 

 so far as I can see, that distinguish Ph. lorea from Ph. dermatodea. 

 But these same specimens, as observed in tide pools at Nahant, soon 

 begin to lose these characteristics. They become thicker and more 

 solid both in stipe and in blade; they grow darker; they become 

 shorter ; the distinction between stipe and blade becomes more 

 marked ; — in fact, they come to have all the marks which serve to 

 distinguish the Phrjllaria dermatodea of Kjellman. Furthermore, all 

 the plants of Phyllaria lorea taken by Kjellman were young. Only 

 one was taken which had zoosporangia in course of development.! 



Professor Kjellman has very kindly sent me specimens both of his 

 Phyllaria lorea and his Ph. dermatodea. The specimens o^ Ph. lorea 

 agree exactly with ray young specimens, which undoubtedly belong to 

 Sitccorhiza dirmatodea, while the specimens of Ph. dermatodea corre- 

 spond in all characters except size to older specimens of the same. 

 Most of my browner specimens are larger, but, as the species is very 

 variable in size, this does not seem to me to be of any great importance. 

 I have little hesitation in believing that the Laminaria lorea, Bory, 



* Taf. XXIV. Figs. 1, 2. 

 X Loc. ciL, p. 227. 



VOL. XXVI. (n. S. XVIII ) 



t A ret. Alg., p. 224. 



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