T. H. BTJFFHAM ON BONNEMAISONIA HAMrFERA. 179 



The arrangement of the ramuli has already been referred to, 

 and Fig. 4 shows a portion of a branchlefc of a Falmouth plant 

 below its summit where the axis is about *3 mm. thick, the 

 ramuli being about '15 mm. thick at the base, and 2 mm. long. 

 These are produced quadrifariously, and on these wholly 

 female plants there is almost always either a procarp or (in 

 the Japanese plant) a cystocarp exactly opposite to a ramulus. 

 The larger bodies (a) at the lower part of the figure are 

 pseudo-cystocarps in which only barren filaments exist instead 

 of carpospores. It is remarkable that notwithstanding the 

 absence of fecundation the pericarp should be so largely 

 developed. I am not aware that any analogous case is known. 



The hamose branches rapidly become thicker up to *6 mm., 

 and are 3*5-5 mm. high. The structure and cortex are exactly 

 like those of the part from which they are produced. 



M. Hariot appears to have been unable from lack of material 

 to describe the " root " which he indicates thus : " Radix ..." 

 The abrupt termination of the axis in Fig. 1 clearly shows its 

 absence in this specimen. One of my plants has a base spirally 

 coiled round a filament of Ahnfeltia plicata J. Ag. The coils 

 of the spiral have coalesced, but the attachment to the Ahnfeltia 

 was not close, for I took the Bonnemaisonia off without damage 

 to either. Within 6 mm. from the spiral the branching com- 

 mences (Fig. 6). 



The cortical cells have a polygonal outline, and on both the 

 ordinary and hamose branches vary in size from 10 to 27 /a, 

 being generally 16 yu, and have richly- coloured contents (Fig. 

 7). I am unable to give more precise indications of the chroma- 

 tophores. In the lowermost portions of the plant the cells are 

 very irregular in form and size, and there are numerous narrow 

 red filaments meandering just below them. Near the apex of 

 a ramulus (Fig. 5) — which is frequently more decidedly mucro- 

 nate than is shown in the figure — the cells are 10-15 /x. 

 Beneath the cortex of the thicker axes there are larger cells 

 up to 45 fi, in diam., and possessing paler contents, the rest of 

 the interior consists of very large cells up to 150 /x, devoid of 

 coloured contents, amidst which is a stout articulated axis 

 with granular contents. 



The question will already have arisen : How came this alga, 

 known only in Japan, to be found in Cornwall ? Yokoska 



