Bslesseriece.^ delesseria.. 259 



mistakeu, Professor Harvey described it in his Manual as 

 Gelidium ? rodratum ; in ^ Piiycologia Britannica/ he figures 

 and describes it as Delesseria angiistissima ; in his excellent 

 Plate Lxxxiii. the figures of the fruit exactly correspond 

 with those of B. alata, except that the tnbercles or capsules 

 in his figure are in sharp-pointed^ axillary ramuli : whereas 

 in my specimens of B. alata they are in the rounded or 

 dichotomous tips of the frond. I have beside me a speci- 

 men from Dr. Dickie, Aberdeen; another from the Rev. 

 Gilbert Laing, Orkney ; and a third gathered by Lady 

 Emma Campbell, in the island of Islay : the latter is a fine 

 rambling plant, in which the compressed edge, of the frond 

 begins to be membranous. 



5. Delesseria Hypoglossum, Lamouroux. 



Hab. On rocks and on other Algse. Annual. Summer. 

 Prequent on the shores of England and Ireland, and not 

 rare in Scotland. 



The distinguishing characteristic of this pretty species is 

 the repeatedly proliferous leaflets from the midrib. It is very 

 variable. The frond is sometimes half an inch in breadth, 

 but this is only in Ireland, where it reaches its maximum of 

 beautv. In Scotland it is not uncommon. In some seasons 

 it is abundant on the coast of Avrshire, and the size is often 



