375 
FLORA, 
RosacBAk. 
Rubus Idaeus, 2. In an enumeration of the Rubi growing indi- 
genously at Kew, it was remarked (K. B., 1909, p. 370), that 
a few clumps of Rubus Teisniex: ins recorded as growing in the 
Queen’s Cottage grounds by the late Mr. G. Nicholson, “ ‘now seem 
to have disappeared ; at all events we could not find an A large 
clump of it has since te pointed out to me by Mr. O R . 
which leaves only A. macrophyllus, Weihe & Nees, unaccounted 
for, and this may well be due toa change of name in such a critical 
group. 
RB, A. BR, 
GRAMINEAE. 
_ Cynodon Dactylon, Pers. Occurs abundantly in: the turf to the 
west of the new range. cS igo oe 
SELAGINELLACEAE. 
Selaginella denticulata, Link. Coll. Sir A. H. Church. Grow- 
ing by a clump of Sazifraga caespitosa over rocks in Rock garden. 
ALGAE, 
CYANOPHYCEAL. 
iphttlionntie Flos-aquae, ag At the end of August, 1911, 
the water of the pond by the Museums was noticed to have a 
peculiar greenish hue oo vs he opaque. This appearance was 
found to be due to the presence of innumerable spine seabed blue- 
green bodies floating and suspended in the water, the spindles 
being as much as }-4 in. long. The spindle-shaped bodies are 
but due to another «blue -green’ aah Clahrweyatis so 
Henfrey (see K. B. Add. Series, v, p. 208). In July, 1908, the 
water of the pond was pea-green in colour owing to the dense mass 
of this alga, and it was also seen in quantity in 1909 and 1910. 
During the present year, however, it has not been noticed, and the 
Aphanizomenon appears to have taken its place. 
The sudden appearance of these algae is known in some parts as 
“the breaking of the meres,” and an ‘interesting note on the subject 
abundance. 
Microcoleus paludosus, Gomont, common at the sides of the paths 
near main entrance in spring. A, D. C.: 
Lyngbya perelegans, Lemm. On submerged stones in stream in 
Rock garden. hc 
