Tili; I'IJCACE^ OF .lAl'AN. lolj 



cdrjtiar, which havu a close reöcnil)liincc lo thein in the vegetative 

 organs. Hence it is very often beyond our power to determine 

 a sterile specimen of these species without more or less uncer- 

 tainty. In addition to the specimens reported below, 1 have a few 

 others which, owing to their incomplete state, can not be referred 

 to any of the species, though they undoubtedly stand in near 

 relation to one or the other of the latter. I therefore omit men- 

 tioning those incomplete specimens any farther, reserving them 

 for future stud v. 



Sanjasswiii aquifoliiuti Aa.? 



Plate XVI. Fig. 18-19. 



Spec. p. 12.— Id.: System, p. 21)7.— J. Ag. Spec. Alg. I. p. .3.S0.— /f/.: 

 Spec. Sarg. Austr. p. 102. — KuTz.: Spec. Alg. p. 607. — Id.: Tab. Phyc. 

 Bd. XI. Taf. 3.— Keixb.: Sarg. Ind. Arcli. p. 73.— De Toni: Sylt. 

 Alg. III. p. 75. 



= Fucus aquifoUus Turn.: Hist. Fiic. Vol. I. p. 112, Taf. 50. 



= Sargassum virescens Fig. et De Xot.: Alg. Mar. Rosso, p. 21. — 

 Zaxard.: PL Mar. Riibr. p. 239. 



Remark on the species. Our specimen is the upper portion 



of a fertile plant. The basal leaves und other characters of the 



lower portion are not known. So far as the specimen reveals, 



the axial stem is smooth and filiform, sending out lateral branches 



in all directions. The leaves on the branches are thin but rigid, 



obovate or oblong, often more or less oblique at the base, and 



are frequently duplicato-serrated on the margin. The ribs are 



delicate but evident, disappearing above at the middle of the leaf 



length. Leaves on the ultimate ramulets are spatulate with acute 



dentations. Vesicles elliptical, unarmed, some of the younger 



ones glandulated, with compressed stipe nearly as long as the 



vesicles. Keceptacles axillary, subcylindrical, sessile, often furcate, 



somewhat verrucose, and cvuioso-racemose on a short ramulet. 



