8 SOME NEW BRITISH MARINE ALGiE. 



wide. There are from 1 to 6 or more cells in the width of the 

 frond. In K. inrestiens there are never more than 2 cells in the 

 width of the filament. From Bangia ciiiaris it is easily distin- 

 guished by its monostromatic frond. 



Colaconema, nov. gen. Thallus microscopic, consisting of 

 rose-red, creeping, irregularly branched, jointed filaments, living 

 in the cell-walls of various algne. Filaments often anastomosing, 

 sometimes loosely united laterally. Monosporangia formed from 

 portions either of the terminal cells of the principal axes, or of short 

 swollen 1- or few-celled lateral branches, or even from a portion of 

 a cell in the continuity of the filament. The undifferentiated portions 

 of the cells forming cup-like bases for the sporangia. 



C. Bonnemaisonise, nov. sp. Filaments flexuous, much and 

 irregularly branched, anastomosing so as to form an irregular net- 

 work between the cortical cells of the host-plant. Cells very 

 variable ia shape, simple, furcate, cruciate or irregular, swollen 

 here and there, varying in length from one to six or eight, or even 

 more times longer than broad, usually 3-6 /* in diameter. Spo- 

 rangia lateral, nearly globular, 9-12 /x in diameter, usually in clusters 

 of from 2 to 6, cup-like base conspicuous, about one-third the size 

 of the sporangium. Growing in the cell-wall of Bomiemaisunia 

 aspariKjoides. Plymouth, Sept. 1895, G. Brebner. Berwick-on- 

 Tweed, K.A.B. 



C. Chylocladiae, nov. sp. Filaments slender, straight or very 

 slightly flexuous, subsimple or sparingly branched, two filaments 

 sometimes united by one or more lateral branches ; cells nearly cylin- 

 drical, very long, often eight to ten or twelve times longer than broad, 

 2'5-3 /x in diameter; sporangia terminal or lateral, oval, 6-8 fx 

 long by 4-6 /x wide, cup-like base of sporangium not conspicuous. 

 In the cell-wall of Clujlocladia ovalis. Torquay, E. A.B. Plymouth, 

 Sept. 1895, (t. Brebner. 



C? reticulatum, nov. sp. Filaments much and irregularly 

 branched, anastomosing so as to form a more or less regular net- 

 work between the cells of the host-plant ; owing to the very limited 

 space in which they grow, the side branches are frequently so 

 closely pressed against the principal branches that they appear to 

 form one filament, composed of a double row of cells. Cells short, 

 angular, about as long as broad or a little longer, 6-8 /x in breadth. 

 Sporangia unknown. In the cell-wall of Desmarestia Dudresnayi. 

 Moville, North Ireland, Oct. 1852, comm. Dr. D. Robertson. Ply- 

 mouth, Oct. 1895, G. Brebner. Montague describes and figures 

 Callithamnoid filaments as part of his Desmarestia Gayana (vide 

 Ch. Gay, Histoire de Chile, viii. p. 242, Atlas Pars. Crypt, tab. xiv. 

 fig. 1), and it is far from improbable that the plant described above 

 is related to the parasite mistaken by Montague for part of the 

 Desmarestia. 1 am indebted to Mr. George Brebner, who did such 

 excellent algological work at Cumbrae m 1898, and is now with 

 equal success mvestigatmg the Marhie Algae of Plymouth Sound, 

 for beautiful specimens of C. Bonneniaisunia and C. CkylociadicB, 

 both species bearing monosporet^. The former, when I received it 

 from Mr. Brebner, was quite new to me, although I afterwards 



