ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
655 
endogenously from young colls near the margin, with a basal zone 
of growth ; (4) the erect assimilating filaments, usually unbranched, 
springing at a distance from the margin, and with apical growth. The 
chromatophores are small and disc-shaped, several in a ceil. The 
secreting cells (described for the first time) are formed from meristematic 
marginal cells, and secrete a brown tannin-like substance, which sub- 
sequently passes into the first-formed hairs. The sporanges are both 
unilocular and multilocular, the latter with a few greater or a larger 
number of smaller chambers (megasporanges and meiosporanges). The 
mode of germination of the zoospores varies according to their origin. 
The following new species are described : — Mijrionema Corunnse on 
Laminaria pallida ; M. polycladum on Fucus serratus ; M. papillosum on 
Laminaria saccharina. A new genus Hecatonema is established, from 
Phycoselis maculans , occurring in three distinct forms ; also Ghilionema 
g. n., distinguished by the erect filaments being united into irregular 
groups. It comprises C. Nathalie sp. n., and G. replans ( Ectocarpus 
reptans Orouan, Myrionema reptans Foslie). The genus Ascocyclus is 
distinguished by its erect sac-like secreting cells, which are situated 
directly on the creeping filaments, and are designated by the new term 
ascocysts. A new species is described, A. sphserophorus , growing on 
Lthodymenia palmata , and distinguished by its nearly spherical ascocysts ; 
also A. hispanicus sp. n. on Saccorhiza bulbosa. 
Hapters of Laminaria saccharina.* — Herr M. Pedersen gives the 
following description of the development of the hapters of this seaweed, 
growing on Furcellaria jastigiata. The sporelings attach themselves 
firmly to a stone, and form, in the first year, a generation of short 
hapters ; after a period of repose, a second generation is formed above 
the first, and so on. The hapters are flattened at the end and branch, 
and are of a firm and stiff consistency. The cell-walls of the central 
layers are strongly thickened ; those of the peripheral layers less so. 
Irritation of the hapter is excited by constant contact, and especially by 
friction. 
iEgagropilae.j — Herr F. R. Kjellman has studied the structure of 
the compact balls composed of densely interwoven filaments of green 
algae which go under this name. On disentangling the weft of filaments, 
it is found that the basal portion differs from the remainder of the fila- 
ment in all perfect individuals, consisting of one or two cells with thicker 
cell-wall, and obviously playing the part of a bud from which the rest of 
the filament has sprung. This was observed especially in a new species, 
A. canescens. The degree of branching of the shoot varies greatly. 
The author regards the mass of filaments in the true AEgagropilse as 
forming a coenobe. He treats AEgagropila as a section of the genus 
Gladophora, differing only from the typical Eucladophorse in the pro- 
perty of forming “ coenobes ” ; while Acrosiphonia, with which they have 
sometimes been associated, is more nearly related to Siphonocladus than 
to Gladophora. 
* Bot. Tidsskr., xxi. (1898) pp. 319-25 (5 figs.). See Bot. Centralbl., lxxv. 
(1898) p. 192. 
f Nova Acta R. Soc. Sci. Upsaliensis (German), xvii. (1898), 26 pp., 3 pis., and 
3 figs. 
1898 2 y 
