114 
THE JOURNAL OF BOTANY 
C. minutus (Kuetz.) Naeg. Cells in groups of two, four, or 
eight, not united into large mucilage masses. Sheath not stratified. 
Cells show very clearly that division is bv constriction. Lemmer- 
maim regards C. helveticus Naeg. as synonymous with C. minutus 
(Kuetz.) Naeg., there being no essential difference between the 
descriptions of these. Our specimens varied very much in size— 
length 5-14//, width 3*5-10 p, sheath 1-2*5/x in thickness—but 
were otherwise constant. The larger specimens exceed the normal 
type, and would fall into C. helveticus f. major I)e Toni. 
Amongst Spiroyyra and in association with Spirulina tenuissima 
Kuetz. Tycholimnetic. Loc. 1. Distr. Eur., S. Afr., S. Amer., 
Antarctica. 
C. minimus (v. Keissler) Lemm. Cells numerous in free floating 
mucilage masses. Sheath spherical to ellipsoidal. Originally de¬ 
scribed by v. Keissler as C. minutus var. minimus , this was separated 
as a distinct species b} r Lemmermann. The Ceylon specimens are 
all tvpical plankton organisms forming very definite free-floating 
colonial masses, in this respect quite distinct from typical C. minutus 
(Kuetz.) Naeg. Since this is the case, there seems to be no reason 
for supposing C. minimus closely related to C. minutus, and the 
species has more similarity with C. limneticus Lemm. and other 
plankton forms. Besides the spherical and ellipsoidal forms of 
colonial sheath, as in the figures of v. Keissler, many of the Ceylon 
specimens showed a tendency to greater elongation and lobing. 
Colonies 100-200 p in length, 30 p in width. Cells 2*5-3*5 p diam., 
cell-sheatli 1 p in thickness. Loc. 2, 3. Distr. Eur., S. Afr., 
Antarctica. 
(To be continued.) 
GEORGE CLIFFORD’S HER BARIUM AND THE ‘ HORTUS 
CL1FFORTIANUS.’ 
By A. B. Rendle, F.R.S. 
There has always been some doubt as to the connexion between 
George Clifford’s Herbarium, which was bought by Sir Joseph Banks 
in 1791, thirty years after Clifford’s death, and the JLortus Clif- 
fortianus , published at Amsterdam in 1737—the systematic account 
by Linnaeus of the plants in Clifford’s garden and herbarium. The 
latter, which passed to the British Museum with the Banksian col¬ 
lections in 1827, is referred to by Robert Brown in bis memorandum 
on the Banksian herbarium as “the principal authority for the plants 
described in one of Linnaeus’s earliest and most celebrated works”_ 
i. e. the Hortus. It was at that time kept separate from the general 
herbarium, but was subsequently incorporated with it during the 
keepership of Mr. Carruthers. 
The specimens are on the original sheets, in the same condition as 
they were when bought by Banks. In many cases, as will be remem¬ 
bered by botanists who have consulted the herbarium, they are 
mounted, in accordance with the custom of the period, as if growing 
