94 University of California Puhlicaiions in Bofanij [Vol. 6 



probability, to be it has been found. It is evidently a Turner specimen 

 and is labelled "U. furcellata . . . (specimen drawn) . . . Sept. 

 1800." It does not agree in every detail with Turner's figure (1801, 

 pi. 1, fig. A), but it does correspond to parts of it and it seems likely 

 that portions only of the specimen were drawn. The specimen, more- 

 over, has the base complete while the drawing lacks the base. It seems 

 allowable to consider this specimen as the type since its agreement 

 with the figure is as close as in certain other undoubted types and 

 drawings of Turner. Through the kindness of the Director. Dr. 

 Prain, and of Mr. Cotton, I have been able to make a microscopical 

 examination of the type, and a section through the cortex is repre- 

 sented in figure 1 on plate 10. The details of structure are the same 

 as in all the other European plants I have been able to examine and 

 I have little hesitation in referring them all to one and the same 

 species (cf. figs. 1-10, pi. 10). The question whether there is one species 

 in Europe, or more than one, must still be left for future investiga- 

 tion. That there is reason for suspecting that there may be more than 

 one species will appear from the fact that Harvey (1841, p. 52; 1846, 

 pi. 69, and 1849, p. 149) speaks of larger specimens (up to half an inch 

 in diameter) than normal and the writer has seen a specimen from 

 Gibraltar in the Herbarium of the British ^Museum of Natural History 

 which is 6 mm. broad. ]\Iere size may not indicate a different species, 

 but it may also be associated with histological differences. Unfortun- 

 ately, at present, it is not possible to make any study of the structure 

 of the specimens mentioned. 



The distinguishing features of the European specimens, all of 

 which seem to be identical with the type of Scinuia furcellata in 

 structure, are the low slender habit, the turgid tips of the utricles and 

 the large number of colored cells usually present in the epidermis. 



Scinaia furcellata var. subcostata 



J. G. Agardh, Spec. Alg., vol. 2, 2, p. 422, 1851, ibid., vol. 3, 1, p. 513, 1876; 



Crouan, Fl. Finist., p. 146, 1867; 



DeToni, Syll. Alg., vol. 4, sect. 1, p. 105, 1897; 



Holmes and Batters, Ann. Bot., vol. 5, p. SS', 1890; 



Batters, Journ. of Botany, vol. 29, p. 274, 1891; 



Bornet, Alg. Schousb., p. 265, 1892. 

 Halymenia furcellata var. suhcostata J. G. Agardh, Alg. Med., p. 98, 1843. 

 Ginnania furcellata var. suhcostata Harvey, Phyc. Brit., vol. 1, jil. 69, 1846. 



The plant described by J. G. Agardh as var. suhcostata under the 

 species is unknown to me except from the description. Agardh 



