lished in the Manual, except it be to record the discovery, by 
Miss Ball im the south of Ireland, of remarkably luxuriant 
specimens, from one of which the uppermost figure in our plate 
has been drawn. Miss Ball’s first specimens were gathered in 
1834, and she obtamed further supplies in 1840 and 1844 :— 
but as all these, like the Devonshire plants, were washed on 
shore, the Aadcfat of the species remains unknown. 
By a recent communication from Mrs. Griffiths I learn that it 
was Miss Hill, and not Mrs. Hare, who was the original disco- 
verer of this species in 1800; but it appears to have been known 
to the latter lady shortly afterwards, and called by her Fucus 
Halensis. ‘Yo Mrs. Griffiths it has been familar for thirty years 
under the colloquial name “ Orange Dwarf,’ which at once ex- 
presses its usually small size, as compared with others of the 
genus, and the rapid change of colour which it undergoes on 
touching fresh water. The last peculiarity is so striking that a 
passing shower of rain has often betrayed it to Mrs. Griffiths, 
when before the shower it had passed unnoticed among other 
red plants. 
Dr. Greville in his ‘ Cryptogamic Flora’ considers it identical 
with WV. Bonnemaisoni, an opinion which he subsequently aban- 
doned; and in his dlye@ Britannice he refers it to VV. Gmelini. 
I agree with Mrs. Griffiths in judging it to be distinct from both 
these species, at the same time admitting that it borders very 
closely on both, and that m the absence of a knowledge of its 
fructification it is difficult to fix on a very tangible distinguishing 
character. I have endeavoured, in the accompanying plate, to 
detail all its known characters. Among these it is impossible to 
overlook the anomalous, but very constant, production of ca/l, 
giving birth to branching filaments, totally unlike the usual form 
of proliferous growth; as certainly not parasitical; neither, so 
far as we know, having relation to fructification. And yet it 
must be confessed that they bear a near resemblance to the 
fructiferous processes of the smgular Australian genus /Zefero- 
cladia of Decaisne. It would be a highly curious and interesting 
discovery should ¢efraspores ever be found on these processes in 
the present species. 
Fig. 1, 2,3. NITOPHYLLUM VERSICOLOR, different varieties :—wxatural size. 4. 
Portion of the frond, to show the structure. 5,6. Apices, producing calli. 
7. Section of a callus. 8. Granules filling its cavity. 9, 10. Ciliz of the 
callus :—all more or less magnified. 
