of the vicinity of Aberdeen. Ill 



E. siliculosus, Lyngb. — Very common in pools near high- 

 water mark. 



E. Hincksice. — This species, of which, as stated in his f Ma- 

 nual/ Mr. Harvey had only seen one specimen, is very abundant 

 on the fronds of Laminaria digitata, and sometimes on Rhodo- 

 menia palmata, in the latter end of April and in May. It appears 

 to be a very distinct species. 



E. tomentosus, Lyngb. — Very common on different species of 

 Fucus near low-water mark. 



E. granulosus, Ag. — Parasitical on other Algae in pools near 

 high-water mark, but rare. 



E. sphcerophorus, Carm. — In June 1843 this species was found 

 abundantly, parasitical on one of the most abundant of our Rho- 

 dospermece, viz. Calithamnion spongiosum. It bears fruit co- 

 piously, and never exceeds, in this vicinity, an inch in height, 

 and usually is much less. 



Myriotrichia filiformis. — Is not unfrequent in pools at high- 

 water mark, attached to small specimens of Chorda lomentaria. 



ChORDARIEjE. 



Chordaria flagelliformis, Ag. — Is very abundant and generally 

 distributed. The fructification, according to Turner, consists of 

 " oblong or pyriform seeds lying among the concentrical fila- 

 ments." I have not been able hitherto clearly to ascertain the 

 true structure of the fructification in this species, but should, 

 from analogy, infer it to consist of spores. 



Helminthocladia virescens. — Is in some seasons very abundant 

 on rocks about half way between high- and low-water marks, and 

 straggling specimens occur in pools at the latter. 



Corynephora marina, Ag. — This remarkable plant is plentiful 

 in summer, attached to other Algse and corallines. In Harvey's 

 1 Manual' a passage is quoted from Carmichael in reference to its 

 fructification, the term " sporidia" being made use of : it ought 

 to be " spores." 



In the first part of this communication it was stated that " the 

 coast here is much exposed to the action of heavy seas, and pre- 

 sents few sheltered coves or even calm pools of any extent, and 

 hence probably we may account for the absence of some of the 

 more delicate species;" it must not, however, be inferred that 

 this is the only reason why certain Algse are entirely absent from 

 our coast ; the influence of temperature must be far greater. At 

 least two other species may yet be expected to be found, viz. 

 Laminaria bulbosa and Dichloria viridis ; the former being of such 

 general occurrence on the British coasts, and the latter having 

 been seen in the Moray Frith. 



Scarcely one-half of the Melanospermous Algse enumerated in 



