94 TEANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



G. setacea, C. Ag. 



I. of Man !, Hilbre I. !, Puffin I. !, New Brigliton. 

 Halurus equisetifolius, Kiitz. 



{Griffithsia equisetifolia, Eeport I.) 



North Wales {fide Kalfs). 



Tribe III. — Monosporeae. 

 Monospora jMclicellata, Solier. 



Hilbre I.!, Puffin I. ! 

 Pleonosporium borreri, Nag. 



I. of Man, Hilbre I., New Brighton. 

 Tribe IV. — Callithamnieae. 

 Rhodochorton rothii, Nag. 



Puffin I.!, Anglesea!, Hilbre I.!, I. of Man! 

 Mersey. 

 B. florididum, Nag. 



Puffin I. !, Hilbre I. !, Anglesea !, I. of Man ! 

 B. memhranaceum, Magn. 



Puffin I. !, Hilbre I. !, I. of Man ! 

 B. seiriolaiium, Gib. 



This species of Bhodocliorton I have ventured to record 

 as new to science.* In character it seems intermediate 

 between the genera Callitliamnion and Bhodocliorton. The 

 erect filaments are unbranched and spring from a mem- 

 branous disc. The tetrasporangia are borne secundately 

 near the apex of the filaments, the oldest near the 

 apex. The species is a very minute one, the filaments 

 being on an average less than 1 nnn. long. I found it as an 

 epiphyte on the main stems of PolysipJionia urceolata var. 

 patens, in the Beacon Channel, West Spit, Puffin I. In 

 the same paper {I.e.) 1 described the mode of formation of 

 sporangia in the genus Blwdochorton by a process of in- 

 novation, a phenomenon which has been observed in 



'Jour. Linn. ISoc. liot. Vol. part 33. 



