ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
661 
divided into five families, — the Nemalionace®, Gigartinace®, Bhody- 
meniace®, Cryptonemiace®, and Bangiace® ; and these again into 
numerous orders. The marine Cyanophyce® are comprised in two 
families, the Nostocace® and Chroococcace®. Under each family the 
general characters and mode of reproduction are explained in detail ; 
uud leading types in each family are specially described. 
Gloiothamnion, a new Genus of Algse.* — Under the name Gloio- 
thamnion Sclmitzianum, Herr T. Beinbold describes the type of a new 
genus of Ceramiace® from Japan, with the following diagnosis : — Frons 
filiformis, teretiuscula, axi monosiphonio articulato, continue corticato 
•constituta ; cortice cellulis conformibus constante ; favell® intra peri- 
derma hyalinum gemmidia foventes plurima [s«c] ad ramos superiores 
sessiles, ramellis conformibus paucis (uno majore) involucrat® ; sph®ro- 
spor® in ramulis stichidiosis immers®, sph®ric®, triangule (?) divis®, 
verticillatim disposit® ; antheridia in pulvinulis superficialibus apices 
ramulorum amplectentibus evoluta. 
Filamentous Thallus of Dumontia.f — Mr. G. Brebner has found 
the discs of Dumontia filiformis forming an incrustation on Fucus serratus. 
The perennial creeping basal thallus is attached to the host on which it 
is epiphytic by plugs of tissue which cause disintegration of the cells of 
the host. This may be brought about by the action of an enzyme 
secreted by the epiphyte. The ordinary filiform thallus owes its origin 
to the intercalary transverse septation of the articulations of certain 
branches of the creeping thallus. The group of active filaments may be 
endogenous or exogenous. These filaments emerge from the creeping 
thallus, remaining attached to it by their basal portion, and, by their 
subsequent growth and division, give rise to the erect annual thallus. 
Phyllophora.J — From an examination of the species of Bfiyllofihora 
belonging to the German Baltic, Herr 0. Y. Darbisliire states that the 
erect thallus is in every respect an outgrowth from the basal disc ; it 
serves both for assimilation and for propagation. The midrib of 
P. rubens is a layer of secondary thickening, corresponding to the 
thickening-layers in the erect cylindrical stem of P. Brodisei and 
P. membranifolia. The nemathece of P. Brodisei is the only propagating 
organ which produces tetraspores. After the impregnation of the carpo- 
gone by a pollinode — which, however, has not been actually observed — 
the fertilising action is transmitted to the nutrient cells by hyphal cells, 
which are at first in connection with the basal cell of the carpogonial 
branch, from cell to cell, after the formation of fresh filaments. From 
these nutrient cells the clusters of spores are then formed by budding. 
The relationship of the various species to one another is dealt with, 
including a new species, P. parvula. 
Acetabularie®.§ — Prof. Graf zu Solms-Laubach publishes a mono- 
graph of this family of Alg®, consisting of the genera Acetabularia, 
Halicoryne , Acicularia, and CJiahnasia g. n. Acetabularia comprises 
14 species, arranged in two sections — Acetabulum, including A. mediter - 
* Hedwigia, xxxiv. (1895) pp. 205-9 (1 pi.). 
f Journ. Linn. Soc. (Bot.), xxx. (1895) pp. 436-43 (2 pis.). 
X ‘Die Phyllophora-Arten d. Westl. Ostsee Deutschen Antheils,’ Kiel, 1895, 
38 pp. and 48 figs. § Trans. Linn. Soc. Lond., v. (1895) pp. 1-39 (4 pis.). 
