6o 
Barber —On the S true hire and 
lamina. The upper ones, by their flattened character, evi- 
dently represent feebly developed leaves ; they are not, 
however, derived from the main lamina by splitting, but arise 
Independently as emergences from the stalk 1 . 
The species L. digitata and L. hyperborea , included in the 
subdivision Digitatae, resemble L. bulbosa In the tough and 
leathery character of their laminas. There is, however, a pecu- 
liarity in these species which I have not found attributed to 
L. bulbosa. This consists in the well-known annual shedding 
of the lamina, and the development of a new one by inter- 
calary growth at the point of junction of stalk and lamina. 
A similar phenomenon is also a marked character in L. sac - 
charina , and is stated by Reinke to occur in Alaria esetdenta 2 . 
It has been maintained that this shedding of the lamina is 
present in L. hyperborea , but is not shared in by L. digitata 
(Le Jolis, Clouston) ; but Foslie states that the observations 
on which this conclusion was based ‘ rest on a wrong inter- 
pretation of the facts.’ 
The stalk in those Laminarias which are at all closely allied 
to L. bidbosa is cylindrical : it Is not divided into regions, and 
the development of the ridge and its hapteres is entirely 
wanting. 
Concluding Remarks. 
It remains to summarise and discuss such results as have 
been given ; although on account of the short time the 
specimens have been in my hands, and the lack of old 
material, I have been unable to investigate many points in 
such a manner as they seem to merit. The main object of 
this paper is the description of the development of the bulb 
and its Illustration by suitable figures. The general course 
of development, as also the peculiarities of the stalk in this 
Laminaria , may be readily learnt by reference to figures 
i to io and 23. It is very evident to any one who studies the 
literature of the subject that this Laminaria has been com- 
1 Agardh, In Bot. Zeit, 1874, No. 35. 
2 Pringsh. Jahrb. x. 1876. 
