lateral lobes very narrow, the basal ones nearly at right angles to 

 the middle lobe; summer leaves several-lobed, the middle lobe 

 longest and largest; flowers large, pale blue in color (Gilmerton, 

 No. 4857, April 20, 1912). 



This hybrid has some resemblance to the hybrid between 

 Viola Brittoniana and emarginata, first found in the District of 

 Columbia, and figured in Rhodora (pi. 71) in 1906. It lacks, 

 however, the stoutness of that plant, and in its more slender 

 habit shows its relationship to Viola septemloba. The name 

 " Viola emarginataX septemloba" has been previously used for a 

 hybrid between Viola emarginata and Viola Brittoniana by Ezra 

 Brainerd (Rhodora 8: 53. 1906). Dr. Brainerd at that time 

 regarded Viola Brittoniana as identical with the more southern 

 Viola septemloba, a position from which he has since receded. 



Viola villosa Walter 

 This southern species has not been previously reported from 

 Virginia. It is quite common near Gilmerton on bushy cut-over 

 land used as a pasture, the soil being very sandy (No. 5079, 

 April 19, 1913). 



REVIEWS 



Two recent works on the marine algae =*" 



The publication, during the past summer, of Professor Bradley 

 M'^ore Davis's studies of the marine algae of the Woods Hole 

 region marks an important forward step in the study of the 

 American algae. In the first part of this work the marine flora 

 as a whole and the various associations of species are discussed 

 from the biological or ecological point of view. After an in- 

 troductory chapter, the author discusses some of the factors 



* Davis, Bradley Moore. A biological survey of the waters of Woods Hole and 

 vicinity. Part I. Section II. Botanical. General characteristics of the algal 

 vegetation of Buzzards Bay and Vineyard Sound in the vicinity of Woods Hole. 

 Bull. Bur. Fisheries 31: 443-544. charts 228-274. 1913; Part II. Section IV. 

 A catalogue of the marine flora. Bull. Bur. Fisheries 31 : 795-833- 1913- 



Weber-van Bosse, A. Liste des algues du Siboga. I. Myxophyceae, Chloro- 

 phyceae, Phaeophyceae, avec le concours de M. Th. Reinbold. Siboga Expeditie, 

 Monographie 59a: 1-186./. 1-52 -{-pi. 1-5. S 1913. E. J. Brill, Leiden. 4to. 



