OP ARTS AND SCIENCES. 181 



bus e Terra Nova convenit nostra plaiita." The first part of the 

 sentence is very vahiable, as it establishes the identity of the L. Bcerii 

 of Postels and Ruprecht. As to the second part, however it may 

 have been with Areschoug's American specimens, the plant distrib- 

 uted agrees so completely with New England specimens that there 

 can be no doubt that the Norwegian and New P]ngland foi ms belong 

 to the same species. Farlow* gives a very careful account oi; the 

 New England plant, and Kjellman t adds greatly to our knowledge 

 of the Arctic forms of the species. 



An interesting paper closely connected with this subject, and one 

 to which I am indebted for many valuable suggestions, is one by Mr. 

 P. A. Barber, entitled, " On the Structure and Development of the 

 Bulb in Laminaria bulbosa.'^ t This paper has made possible a fairly 

 satisfactory comparison between the earlier stages of Laminaria bul- 

 bosa, Lamour., and of L. dermatodea, De la Pyl., and helped to make 

 the discussion of the relationship existing between the two species 

 much more satisfactory. 



Periods. — For convenience of description, the life-history of Sac- 

 corhiza dermatodea may be divided into four periods, each of which is 

 characterized by some important changes in development. 



First Period. — This period naturally deals with the development 

 from the spore. The material is wanting for any satisfactory treat- 

 ment, and as the plants are at first of microscopic size, these earlier 

 stages will be discussed under the portion devoted to the histology. 



Second Period. — 1. Earliest Stages found. — The smallest speci- 

 mens available are two or three which measure 5 to 6 mm. in length. 

 They were found growing in the same clusters with larger ones of the 

 same species, and were detected only by very careful search. Smaller 

 ones were sought for through each bunch collected, but none were 

 found. A hand lens is necessary in examining these specimens. The 

 point of attachment has been lost in every case. The stipe is dis- 

 tinct, and is about 1 mm. long and 0,14 mm. wide at the middle. It 

 seems to be nearly cylindrical in shape, and expands gradually into 

 the blade at the upper portion. The blade, which has thus a wedge- 

 shaped base, is generally ovate or obovate, the broadest portion being 

 in most cases about two thirds of the way from the base. The tip of 

 the blade either tapers to a more or less acute point, or is blunt and 

 truncated from having lost the terminal portion. Below, the stipe 



* N. E. Alg., p. 95. t Arct. Alg., p. 223. 



t Annals of Botany, Vol. III. No. IX. p. 41, February, 1889. 



