structure with the other species so named, our genus Litosiphon, 

 which has been formed to include the present plant and the 

 Asp erococcus pusillus, Carm. (PL CCLXX.), must probably be 

 given up. By Ktitzing these plants are, however, widely sepa- 

 rated, A. pusillus being associated with the Chlorosiphon Shuttle- 

 worthianus of that author, a production which I regard as merely 

 the very young state of Chorda lomentaria. I cannot consent 

 to separate these parasites, which appear to me to have a close 

 relationship and similar structure. 



By its first discoverer our L. Laminaria was placed in Bangia, 

 which was then a common receptacle for any filiform plant 

 marked with transverse, closely-set bands of cells. Here for a 

 long time it was suffered to remain unmolested, though almost 

 every author who subsequently described it agreed in pro- 

 nouncing that it had no natural affinity with the type of the 

 genus Bangia, and was even referable to a different Series or 

 great division of the Algae. Still no one, till recently, took any 

 active step in the matter. Many years ago, Mr. David Moore 

 remarked the affinity of Bangia ? Laminarice with Asperococcus 

 pusillus, and suggested the propriety of forming a genus for 

 their reception, a suggestion which I recorded with approbation 

 in the first edition of the Manual (p. 173), but did not then 

 adopt. Mr. Moore is therefore properly the originator of the 

 present generic group, to which I have now merely given a 

 name. 



Fig. 1. Portion of the frond of Alar la esculenta, with tufts of Litosiphon 

 Laminarls: growing on it : — the natural size. 2. Tuft of fronds. 3. Apex 

 of a frond. 1. Base of the same. 5. Part of the middle portion of the 

 same : — all more or lass highly magnified. 



