86 THE JOURNAL OF BOTANY 



at the distance of half an inch into a frond about two and a half or 

 more inches wide, and then dividing up in a palmate manner into 

 broad wedge-shaped segments, irregularly lacerate- dentate at the 

 margins. I have not seen this form in Britain, although it is re- 

 corded by Mr. Batters in his Revised List of British Marine Alga 

 (1902) for Falmouth and Orkney. 



2. Var. undulata J. Ag. Agardh does not refer to any illustra- 



This plant is not unfrequent in South Devon 

 iffers also from the typical C. reniformis in its 



tion of this plant, but his description of its extremely short stem 



and undulated entire or slightly lobed frond will readily distinguish 



it when met with. 



in deep water. It diffe 



brighter colour and slightly thinner consistence. 



3. Var. Ferrarii J. Ag. Unfortunately Zanardini has adopted 

 this name for a different variety. The illustrations which Agardh 

 cites for his plant — viz. Kiitzing (Tab. Phyc. xvii. tab. 79) and 

 Turner (Hist. Tur. no. 113, fig. g)— show a nearly sessile obovate 

 frond with numerous prolifications of the same shape. 



Of these three forms, the var. undulata is so distinct in habit 

 that it might well be regarded as a distinct species, but I have 

 never met with it with cystocarpic fruit. t 



During the last twelve months I have received from Miss C. E. 

 Larter, of Combe Martin, North Devon, who has recently taken up 

 the study of marine alga*, a series of specimens so different from 

 all of the three above varieties, that the plant seems deserving of a 

 distinct name. The characters it possesses are constant during 

 the year, since I have received each month specimens with cysto- 

 carpic fruit, and presenting the same habit and mode of growth. 

 I therefore propose to characterize it as a distinct species as 

 follows : — - 



Callymenia Larterise, n. sp. Fronde gelatinoso-membra- 

 nacea fusco-purpurea, a disco radicali in laminam anguste cuneatam, 

 irregulariter fissam, expansa ; prolificationibus numerosis elliptico- 

 ovatis vel oblongis, margine aut raro superficie excrescentibus. 

 Cystocarpiis numerosis, utrinque prominulis irregulariter sparsis. 



The colour of the frond is of a duller colour than that of the 

 typical form of E. reniformis, or of its var. nndulata, having more 

 of a brownish red tint. In none of the specimens that I have seen 

 do the prolifications attain the size of the original frond. The 

 plant bears cystocarps throughout the year, scattered over the whole 

 frond, except on the young prolifications. I have seen this plant 

 only from Combe Martin and Torquay. 



Explanation of Plate 484 b. — Callymenia Larterhc Holmes, sp. nov. 

 1, Plant, nat. size; 2, Transverse section of thallus, x 180; 3, Section oi 



cystocarp, x 80. 



