ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 227 



independent species of Ectocarpus ; but from which is developed the erect 

 typical form of Pogotrichiim. Ectocarpus tomentosoides is also hetero- 

 morphic ; and other examples are given. 



For the earliest condition of these polymorphic Algae the author pro- 

 poses the term prostade, with the corresponding terms prosporange and 

 prospore. 



Compsonema, a new Genus of Phseosporeae.* — Under the name 

 Compsonema gracile g. et sp. n., Herr P. Kuckuck describes a seaweed 

 from the Adriatic which forms small brown cushions on stones. From 

 a unilamellar basal disc there arise unbranched monosiphonous assimi- 

 lating filaments about 1 cm. long. Only plurilocular sporanges were 

 found, having the form of pods. Like the basal hairs, they are placed 

 laterally on the assimilating filaments, and are stalked or sessile. In 

 each cell is a chromatophore. The genus belongs, or is at least nearly 

 allied, to the Myrionemaceae. 



Transference of Inorganic Substances in the Laminariaceae.t — 

 Herr N. Wille gives the result of analyses of different parts of the plant 

 in two species of Laminaria (Glotistoni and saccharina). When tho- 

 roughly cleansed from sand and the valves of diatoms, the analysis 

 shows only traces of silica. The amount of ash in the young leaves is 

 much smaller than in the old leaves ; the proportion of phosphorus, 

 nitrogen, chlorine, sulphur, potassium, sodium, and magnesium decreases, 

 while that of lime increases. The stipe agrees essentially in composi- 

 tion with the older parts of the leaf. 



Asperococcus with two kinds of Sporange.J — In the Adriatic Herr 

 P. Kuckuck finds a new speceies of Asperococcus, A. scaber sp. n., with 

 both unilocular and plurilocular sporanges. It is distinguished from 

 the other known species of the genus by having a basal disc instead of a 

 protonemoid horizontal thallus. The plurilocular sporanges are much 

 the more numerous, and are collected into sori on erect filaments which 

 exhibit the characteristic differentiation of pith and cortex. 



Female Conceptacles of Sporolithon.§ — Herr F. Heydrich has 

 found the hitherto unknown female conceptacles of Sporolithon molle, 

 belonging to the Uorallinacese. The structure of the thallus is also 

 described in detail, as well as the nature of the so-called cuticle, the 

 pits of the thallus-cells, the procarp, hymenium, gonimoblasts, and 

 spores, and the mode of formation of the cystocarps. 



Alternation of Generations in Cutleria.||— Following out the deve- 

 lopment of Cutleria multifida, and the relationship to Aglaozonia, the 

 conclusions arrived at by Herr P. Kuckuck coincide in the main with 

 those of Church. From the non-sexual Aglaozonia spores he obtained : — 

 (1) Normal Cutleria plants with oogones ; (2) Confervoid plants with 

 oogones, the vegetative portion being but little developed ; (3) Confer- 



* Beitr. z. Kenntniss d. Meeresalgen, Kiel, 1899, pp. 90-4 (1 pi.). See Hedwigia, 

 xxxviii. (1899) p. 272. t r'estschr. f. Schwendener, 1899, pp. 321-40 (8 rigs.). 



J Beitr. z. Kenntniss d. Meeresalgen, Kiel. 1899, pp. 47-53 (1 pi. and 1 tigs.). 

 See Bot. Centralbl., lxxx. C1899) p. 266. 



§ Bibliotli. Bot., Melt 49, 1899, 26 pp. and 2 pis. 



Beitr. z. Kenntniss d. Meeresalgen, Kiel, 1899, pp. 95-116 (2 pis. and 15 rigs.). 

 See Bot. Centralbl., lxxx. (1899) p. 26. Cf. ibis Journal, ante, p. 90. 



