1 6 THE MARINE ALGyE OF ESSEX. 



GYMNOGONGRUS, Mart. 



Gymnogongrus griffithsiae, Mart, " Flor. Brasil.," p. 27. 

 Felixstowe and Dovercourt, G. P. Hope. 



G. norvegicus, J. Ag., " Spec. Alg.," ii., p. 320. Felixstowe, 

 G P. Hope and E. A B. 



AHNFELTIA, Fr. 



Ahnfeltia plicata, Fr., " Fl. Scand.," p. 310. The first record 

 of this as an Essex plant is in Ray's "Synopsis," ed. ii., p. 4, where 

 the following passage is to be found : " Alga exigua dichotoma 

 arenacei coloris. Small sandy or amber-coloured wrack. In littore 

 Essexiano non procul Harvico collegit D. Newton prope Walton 

 vicum." Several specimens preserved in the Buddie and Petiver 

 collections ("Herb. Sloane," vols. 114 and 150, Brit. Mus.) prove 

 that Ahnfeltia plicata is the species referred to. The plant still 

 grows in the same neighbourhood, for there is a specimen with the 

 note, " On round flints at Felixstowe," in the Hope collection. The 

 plant is also to be met with at Southend and Clacton. 



(In a recent paper (" Flora oder Allg. Bot. Zeitung," 1893, heft 5, 

 pp. 368-418) Prof. Schmitz asserts that what have been considered 

 asexual reproductive organs (nemathecia) of Gyinuogongnis griffif/isicc, 

 G. norvegicus, Phyllophora rubens and Ahnfeltia plicata are really 

 parasitic Floridece. Of these parasites the following occur in Essex. 



ACTINOCOCCUS, Schmitz. 



Actinococcus aggregatus, Schmitz, I.e., p. 385. On G. 

 griffithsicE. Felixstowe, G. P. Hope. 



Actinococcus peltaeformis, Schmitz, I.e., p. 387. On G. 

 twrvegicifs. Felixstowe, E. A. B. 



COLACOLEPIS, Schmitz. 

 Colacolepis incrustans, Schmitz, I.e., p. 417. On Phyllo- 

 phora rubens. Clacton, E. A. B. 



STERROCOLAX, Schmitz. 

 Sterrocolax decipiens, Schmitz, I.e.. p. 397. On Ahnfeltia 

 plicata. Felixstowe, G. P. Hope.) 



