182 MINNESOTA BOTANICAL STUDIES. 



Napili Harbor. Alaui. April 16. 1902. (U. S. Fish Com. 

 3881 A.) 



This form very closely resembles Galaxaura acuminata and 

 very possibly is a variety of that species. In external appearance 

 it differs from G. aciimiuata only in its greater pubescence, espe- 

 cially in the region of the caudex. This is in some plants markedly 

 hirsute and in all cases the long hairs are much more abundant than 

 in G. acuminata. Under the microscope it can be distinguished 

 from that species by the structure of the parenchymatous layer and 

 by the terminal cells of the short assimilatory filaments. The cells 

 of the cortical layer are more firmly joined into a parenchyma than 

 in G. acuminata. The inner cells of the cortical layer are much 

 broader than in that species, 50-60 mic. high by 70-90 mic. wide. 

 The cells of the outer layers are much as in that species, about 

 25 mic. high by 50 mic. wide. 



The assimilatory layer is borne as in G. acuminata and has the 

 same structure as in that species. The basal cell averages 20 mic. 

 high by 12-15 mic. wide. The distal cells vary considerably in size 

 and shape, the most common form being ovate or somewhat pear- 

 shaped, with the broadest part below. As in G. acuminata they are 

 usually rounded at the summit, but sometimes apiculate. The 

 chromatophore is very conspicuous and is crowded into the distal 

 one-fourth or even one-fifth of the cells, the remaining portion 

 being quite hyaline. 



Section VIT. Vepreculae Kjellm. 



Galaxaura hystrix Kjellm. (?) Om Floride-Slagtet. Galax- 

 aura. 79. 1900. 



Arborescent ; frond consisting of an elongated, terete, spongy 

 trunk and flattened, forked leaves ; each cell of the superficial layer 

 bearing a single clavate, briefly apiculate papilla, 25-30 mic. long, 

 above about 17 mic. in diameter. 



Bird Island. August 8, 1902. 40-56 fathoms. Co. S. P. Sh. 

 (U. S. Fish Com. 4164.) 



A single .somewhat fragmentary specimen which may very 

 probably belong to a new species allied to the above. The general 

 aspect of the frond agrees closely with the above. It is arborescent, 

 about 6 cm. high, with a proliferating trunk about 1.5 mm. in diam- 



