No. 3] REMARKS ON NORTHERN LITHOTHAMNIA. 127 



lins, Penhallow!); West Greenland: Holstensborg Fjord nor- 

 thern side, f. Laminarice (Ostenfeld!); Pacific coast of America: 

 Monterey, Cal., f. australis (Gibbs!), La Jolla, Cal., f macrocarpaQ) 1 ) 

 California, f. Corallines (herb. Far low!) The species is besides 

 stated by Rosanoff from Australia. It is also possible that L. 

 canescens Fosl. from Japan only represents a form of this species. 



The above remarks concerning L. pustulatum were ready for 

 the press, when I received from Dr. Rosen vinge the recorded f. 

 Laminarice from West- Greenland. 2 ) He kindly communicated to 

 me that the species of another alga to which the crusts are atta- 

 ched probably represent parts of the cortical layer of a rotten stem 

 of Laminaria longicruris. After this find within the arctic zone, 

 I do not think the view tenable that L. pustulatum should also 

 embrace L. macrocarpum. It does not seem likely from a phyto- 

 geographical point of view. I, therefore, think it reasonable to 

 propose that both shall be considered as independent species, though 

 at present a definite line can hardly be drawn between them. On 

 this account I have been rather uncertain as to the understanding 

 of this series of forms. W T ith altered delimitation of species, however, 

 it will prove necessary, what I already suggested above, to drop 

 f. Corallines as a denominated form. It ought to be referred partly 

 to L. pustulatum, partly to L. macrocarpimi f. fceroensis and f. 

 intermedia. The form Corallines being taken in the sense suggested 

 by Air. Crouan, this form and f. intermedia are likely to be 

 identic. But it will be quite fallacious to admit the former de- 

 nomination as embracing a form which occurs on many different 



*) From Monterey, Cal., I have in hand a well developed specimen with 

 sporangia, growing on Nitophyllum Ruprechtianum, which seems to be 

 a certain f. australis. On the other hand, two specimens from La Jolla 

 are uncertain. One of them growing on Dictyota Binghamiana bears 

 conceptacles, about 280 /•>- in diameter, and the other growing on Rhody- 

 menia corallina is furnished with empty conceptacles which are 400 — 500 ft- 

 in diameter. The former possibly belongs to f. australis, and the latter 

 probably belongs to f. macrocarpa, though the conceptacles are somewhat 

 lower than in this form. 



-) It is also to be observed that they were written before my remarks under 

 Lithoth. tophiforme (p. 53) concerning the partition of the sporangia. 



