without laceration. Its colours are sometimes much brighter
than at 'others, especially (as observed by Dr. Drummond) in
places where it is exposed to the dripping of fresh water.
The affinity of this obscure plant is rather doubtful, and I am
by no means satisfied with the position which I have now
assigned to it, next the Nullipores. It difiers from those vegetables
in wanting the lime which forms so remarkable a portion
of their solid contents; but its cellular structure is not very
unlike that of a Nullipore, and there is a near resemblance in the
fructification. The cells composing the frond in the Nullipores
or Melohesioe, are longer and narrower than those of the Hilden-
hrandtia, but arranged in an order nearly similar.
Kützing (Phyc. Gen. p. 384) makes three species ; H. san-
guinea, H. rosea, and H. Nardi, which to judge by the author’s
diagnoses, differ from each other merely in colour;—the first
being “ferrugineo-sanguinea,” the second “ coccineo-rosea,” and
the third “ luteseenti-fusca, siccitate nigrescens.” This last may
possibly be our Bal/sia.
I am not acquainted with the writings of the botanist to whom
this genus is dedicated.
Fig. 1. H i l d e n b e a n d t i a e u b e a , on a stone:— natural size. 3. Portion of
tlie frond, with disc-like depressions. 3. Section of the same, cut through
a conceptacle. 4. Tetraspores ■.— all >