ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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the leaf-insertion and the incurvedf' , dorsal margin of the leaves. It is 
nearly related to Adclanthus and Marsupidium. 
Algae. 
Cicatrisation and Prolification in Marine Algae.* — Herr E. Kiister 
describes the methods by which injured cells and tissues are regenerated 
in sea- weeds. Cicatrisation-membranes in injured cells are almost con- 
fined to the Siphoneae, especially to Anadyomene ( stellata ) and Halimeda. 
Cicatrisation-tissues are much more widely distributed. In Fucus and 
Halidrys they assume the form of tuberous outgrowths. Prolification 
after injury occurs commonly in the Phseophyceae and Florideae, and is 
found also in the Siphoneae and Fucaceae ; it is especially common in 
the Squamariacese. In most cases the adventitious shoots spring from 
the mid-rib which contains the conducting elements. In many of the 
more highly organised Fucaceae it is only the long shoots which are 
capable of prolification. Fucus , Pelvetia, and Gelidium display especial 
capacity in this direction. Padina pavonia is characterised by its 
capability for vegetative multiplication. 
Coating of Algae on Plants in Greenhouses.! — Herr A. Maurizio 
enumerates the Algae (including Schizophyceae) which are most com- 
monly found on cultivated plants, chiefly in greenhouses and hothouses. 
There are no special species characterised by this habit, and the condi- 
tions which favour their appearance and disappearance are involved in 
much obscurity. The injurious effects on the host-plant arise chiefly 
from the deprivation of light and the hindrance to transpiration. 
Chantransia endozoica sp. n t — Mr. 0. V. Darbishire records the 
first example of a Chantransia parasitic on an animal organism, viz. on 
Alcyonidium gelatinosum off the south of Ireland, imparting a red colour 
to the host. It is characterised by the absence of hyaline hair-struc- 
tures, and of a distinctly differentiated basal organ. It develops both 
on the outer wall and in the interior of the host. 
Harveyella mirabilis. § — Mr. H. H. Sturch has found this parasitic 
alga growing abundantly on Rhodomela subfusca , forming small hemi- 
spherical cushions. The thallus, when mature, consists of three parts, — 
much-branched filaments growing in the interior of the host, which 
absorb nourishment from the contents of the cells of the host, and a 
hemispherical external portion, composed of a small-celled peripheral 
layer and a larger-celled central mass. The antherids are developed 
over the whole surface of the frond, the trichogynes from growing 
peripheral cells. The carpogonial branch invariably consists of three 
small cells, upon which is seated the carpogone with its trichogyne. 
The peripheral cell to which the carpogonial branch is attached is 
the auxiliary cell. When the trichogyne is ready for impregnation, it 
projects considerably beyond the surface of the plant, and is covered by 
a thick gelatinous sheath. By fusion of the auxiliary cell with the cells 
of two small sterile filaments, a large cell is produced, which is soon 
divided into an upper smaller hemispherical cell and a lower larger 
* Flora, lxxxvi. (1899) pp. 143-60 (6 figs). f Tom. cit., pp. 113-42 (1 pi.). 
X Her. T)eutsch. Bot. Gesell., xvii. (1899) pp. 13-7 (1 pi.). 
3 Ann. of Bot., xiii. (1899) pp. 83-102 (2 pis.). 
