210 PROCEEDINGS OP THE AMERICAN ACADEMY 



and the Phyllaria lorea, Kjellm., are younger, and perhaps in certain 

 cases more delicate, stages of Saccorhiza dermatodea. 



In his recent paper on the Alg:e of East Finmark (p. 74), Foslie 

 describes some young stages of Saccorhiza dermatodea which seem to 

 agree very closely with those occurring on the New England coast, 

 and his remarks on these tend to confirm the views expressed above. 



Forms of Saccorhiza dermatodea. — Kjellman * describes two forms 

 of his Phyllaria dermatodea, one of which, f. typica, has abundant 

 cryptostomata ; and under this he makes a reference to Farlow's 

 plant described in the New England Algaj. But, as I have shown, 

 the adult plant has no cryptostomata, which character would tend 

 to refer it to the other form, arctica, which has no cryptostomata 

 in the adult condition. But f. arctica has few in the young con- 

 dition, according to the description. Here, however, 1 may refer to 

 what I have shown above, that Kjellman's description of the young 

 Ph. dermatodea does not agree entirely with mine. As the Norwegian 

 plant distributed by Areschoug agrees well with our New England 

 specimens, it certainly seems to me that these two varieties or forms 

 of Kjellman represent merely different stages in the life history of one 

 plant. 



In the paper on the Algae of East Finmark alluded to above, Foslie 

 describes two new forms of Saccorhiza dermatodea (p. 74). These, 

 as nearly as can be judged from the description, exist also among 

 New England specimens ; but there is no constant difference, and 

 they seem to me to be merely states of the same plant, differing in 

 shape and color on account of difference in age, or with varying con- 

 ditions of light, exposure, etc. ¥. lanceolata, as far as measurements 

 and description indicate, is mostly a younger and more delicate form 

 than f. oUonga. On the New England coast the matured fruiting 

 plants are remarkably uniform in size, shape, and color for a species 

 of the Laminar iacecE, and so I can see no reason for separating our 

 plant at least into different varieties or forms. 



Relation to Saccorhiza bulbosa, De la Pyl. — The resemblance 

 between S. bulbosa and S. dermatodea is pointed out by De la Pylaie 

 in his first paper. f The rhizogen and the production of the two 

 whorls of hapteres are the same in both species. After that the rhizo- 

 gen of *S'. dermatodea ceases to form hapteres, while that of S. bulbosa 

 continues to do so indefinitely, and produces that characteristic organ, 

 " the bulb." The development of the tissues in this organ is, so far as 



* Arct. Alg., p. 223. t Ann. Sci. Nat., Ser. 1, Tom. IV. p. 179. 



