the light.” The same specimens are described by Greville tlius :—
“ Filaments hyaline, yelloxoish, exceedingly slender, elongated,
flexible, scattered,” “ neither fasciculate nor tufted.” Thus what
Carmichael sees opake and snow-white, Dr. Greville describes as
hyaline and yelloxoish. If we further contrast the words of the
several descriptions, other as striking discrepancies will be seen.
So tliat, liad I not received authentic specimens of the original
plant, named by Carmichael himself, I should not liave hesitated
to regard his description as drawn from another species; I can
now only attribute the differences to a defective microscope. It
should be stated, however, that I have only seen this plant in a
dried state, when its colour may have altered from white to yreen.
Under the higher powers of the microscope the green endochrome
(of the dried specimen) is very obvious; the “ yellow and hyaline
” cliaracter mentioned by Greville, has reference to the
empty tube, from which the colouring matter has been dis-
charged. I have only seen Carmichael’s specimen, but as he
found it abundantly at Appin, it is probably still to be met with
on that coast, and is worth looking after.
Fig. 1. Small fragment of E nteeomokpha clathkata, with Calotheix luteola
infesting i t :— the natural size. 3. The same:—h'
3. Portions of threads of the Calothrix:— more highly i