208 PROCEEDINGS OF THE AMERICAN ACADEMY 



III. The cryptostomata are present on tlie one-layered portion of 

 the blade as clusters of hairs upon the fiat surface ; in the more com- 

 plex portions, they occupy saucer- or bowl-shaped depressions ; and 

 these finally are provided with a prominent projecting margin, as 

 shown above. 



IV. The medulla is largely made up of hyphse developed in the 

 same way as in the other LamniariecE. 



V. Peculiar sclerenchyma fibres are developed in the medulla both 

 of the stipe and of the blade. 



VI. The paraphyses are destitute of the conspicuous terminal ap- 

 pendage present in almost all the other Laminariece. 



VII. There is present a series of stages in which the maximum of 

 growth is attained, and this series of stages is more or less sharply 

 marked off from the adult stages by a process very similar to that 

 known as " the renewing of the blade " in other Laminariece. 



VIII. The adult frond is destitute of cryptostomata. 



Relation to Phyllaria lorea, Kjellm. — Kjellraan has made a careful 

 study of the old Laminaria lorea, Bory,* and has decided that it is a 

 distinct species, but high Arctic in its distribution. He has given his 

 reasons for considering it distinct from the Laminaria dermatodea, 

 De la Pyl., in the " Arctic Algne." Stromfelt f follows Kjellman in 

 keeping it distinct. I have searched for the species most carefully 

 among my collections from the New England coast, and have studied 

 Kjellman's descriptions in order that I might be able to recognize 

 the plant. The following comparison between my experience with 

 New England Saccorhizce and Kjellman's with Spitzbergeu and Nor- 

 wegian specimens may throw some light on the subject. 



Beginning with the young plants, Kjellman says that there is a 

 marked difference between the two species. Young plants of S. der- 

 matodea have a distinct stipe, a dark brown color, are '' only little 

 translucent, and provided with very few short-haired cryptostomata." 

 The other species {Ph. lorea) has only a "very short stipe, passing 

 without definite limit into a narrow, sometimes almost filiform, linear, 

 or more usually lanceolate lamina. Their lamina is thin, very light 

 brown, almost yellowish brown, perfectly pellucid with numerous long- 

 haired cryptostomata." X 



The great majority of the young Saccorhizce to be found along the 



* In J Aff., Spec. Alp., Vol. I. p. 130, 1848. 



t Algvcg. Isl., pp. 42 and 76, 1886. } Arct. Alg., p. 224. 



