Cryptogamic Plaitts from the Ionian Islands. 339 



3. S. confervoides. Ag. Sijst. Alg. p.232. Fucus confervoicles. 



Turn. Hist. Fiic. t. 84. 



4. S. acicularis. Ag. Si/st. Alg. p. 237. Fucus acicularis. Turn. 



Hist. Flic. t. 126. 



Genus 18. Delesseria. 



1. D.tenerrima, fronde tenuissimà, avenià, lineari, dichotonià, 

 roseA, apice obtusâ : soris sporidiorum sparsis. Tab. III. 

 f. 2. 



In the sea, attached to shells, corallines, and marine plants. 



Koot, a very minute callous disk, giving rise immediately to 

 several very (XeWcdie fronds, which are from 2 to 4 inches in 

 length, and regularly divided many times in a dichotonious 

 manner, the segments divaricated, linear, 1 — 3 lines in 

 breadth, obtuse at the apex, the margin entire. The reti- 

 culation is very irregular, similar to that of D. punctata. 

 Colour a most delicate and beautiful pink, acquiring a 

 brownish tinge towards the base ; but in decay becoming 

 almost colourless. I have not observed any capsular fruc- 

 tification, but the sori (as Agardh calls the clusters of seem- 

 ingly naked granules) are scattered without any particular 

 order over the frond. 



It is now two years since I received excellent specimens of this 



highly beautiful plant, collected in Devonshire by my esteemed 



friend Mrs. Griffiths : as few persons are so well acquainted with 



the actual vegetation of marine Alga, her opinion in favour of 



its being an undescribed species must be allowed to have great 



weight. Besides however studying the preserved specimens, I 



had an opportunity of examining some in their native place of 



growth at Torquay a few weeks ago, and thus am enabled to add 



my opinion to hers in support of their distinctness. 



At 



