586 Howe: Phycological studies 



18-22. Fusion of sporogenous filarrent with auxiliary-cells : in figure 21, two cells 

 (indicated by dotted lines) appear in the position formerly occupied by the auxiliary- 

 cells ; in figure 22, three cells occupy this position — the protruding one at the left will 

 form the main body of the cystocarp or one lobe of it. 



23-26. Cystocarps, showing relation to original auxiliary-cell branch and to the 

 sporogenous filaments. The small peduncled cystocarp, developed at some distance 

 from the original auxiliary-cell, shown in figure 26, is abnormal. Figures 24 and 25 

 show mature cystocarps, the one unilateral, the other more symmetrical and 3-lobed. 



Figures 12-26 are all enlarged 193 diameters and are all drawn from the type 

 material, no. j/j (Castle Harbor, Bermuda). The outer limits of the gelatinous cell- 

 walls are scarcely visible except by staining and the lines as drawn give an exaggerated 

 idea of their distinctness. 



Addendum 



While this paper is going through the press and is in the paged-proof stage, an 

 opportune communication from Mr. J. R. Tovey, acting curator of the National Her- 

 barium of Victoria, Australia, reaches us, enclosing a portion of the original specimen 

 of Kiitzing's Halimeda brevicaulis, a species which is discussed on page 564. As is 

 true in the case of several other species, Kiitzing evidently saw the plant in " Herb. 

 Sonder," which is now in the possession of the National Herbarium of Victoria. 

 The label of the specimen in question, a transcription of which we owe to the kind- 

 ness of Mr. Tovey, reads, "Halimeda brevicaulis Kuetz. Tab. Phyc. VIII. tab. 25. 

 India occidental." In the place of original publication, the locality is given as 

 " Bahamas-Inseln," but the fragment sent by Mr. Tovey is manifestly the very one 

 sketched by Kiitzing in his figure b. The plant is not Halimeda favulosa ; as already 

 surmised (page 564), it is probably to be considered a lax flaccid condition of //. 

 tridens (//. iucrassata). The peripheral utricles, however, are rather larger than is 

 usual in H. tridens, measuring 50-80^ in diameter in surface view; the filaments of 

 the central strand cohere at the nodes. 



Mr. Tovey kindly sends us also fragments of the flabellum and stipe of Kiitzing's 

 Rhipilia longicaulis, to which we have alluded on pages 567 and 568. These indicate 

 clearly, we think, that the species is the same as the more recently published Avrain- 

 villea Mazei Muir. & Boodle. The filaments of the flabellum are now and then 

 slightly torulose, but they are mostly cylindrical without constrictions, except for the 

 strong one where they leave the dichotomy ; Ihe ends of some of the branches are thin- 

 walled and shriveled, but they are not destitute of chlorophyl and should not be con- 

 sidered hairs. 



