ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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authority. The author classifies the numerous families in three 
groups, viz. : — (1) Unilocular sporanges only Laminariacese (except 
the Chordese), Sporochnacem, Spermatochnacem, Dictyosiphonaceae, 
Desmarestiaceae, Striariaceae ; 37 genera and 145 species. (2) Pluri- 
locular sporanges only : — a portion of the Scytosiphonaceae ; 4 genera 
and 7 species. (3) Both unilocular and plurilocular sporanges : — 
Lithodermaceae, Balfsiaceae, Stilophoraceae, Chordariaceae, Elachisteaceae, 
Myriotrichiaceae, Eucoeliaceae (the greater part), Sphacelariaceae, Choris- 
tocarpaceae, Ectocarpacete, Tilopterideae, Nemodermaceae, Cutleriaceae ; 
70 genera and 200 species. The last five families have also other repro- 
ductive organs, besides ordinary unilocular and plurilocular sporanges. 
In another paper * the author confirms the observation of Berthold of 
the conjugation of the zoospores (gametes) formed in the plurilocular 
zoosporanges of Ectocarpus siliculosus, and gives further details respecting 
the heterogamous impregnation of E. secundus. E. Lebelii has both 
antherids and unilocular sporanges, which are probably oogones; the 
zoospores appear not to have completely lost their sexual character. 
E. Padinse ( Giffordia Padinse ) possesses antherids, and two kinds of 
sporange, meiosporanges and megasporanges. The author further calls 
attention to the fact that in E. tomentosus , and in some other species of 
the order, the zoospores of the unilocular sporanges are, in opposition 
to what is generally the case, larger than those of the plurilocular 
sporanges, and that their mode of germination differs from that of the 
latter. 
Epiphyllous Algee.j — Herr W. Schmidle gives a clavis of nine 
species of Trentepohlia, classified under the two subgenera Eu-Trente- 
pohlia and Heterothallus. He regards the genus as strongly poly- 
morphic ; the following new species are described : — T. ellipsicarpa , 
pinnata , and minima. The author finds an epiphytic species of Scytonema 
the only one at present known, which he names S. tenuissima , epiphytic 
on the upper surface of leaves. 
A new species of Pithophora , P. clavifera , from New Guinea, is also 
described. 
Nordstedt’s Index of Desmids.f — This most useful work consists of 
a Bibliography of the Desmidieae down to the year 1896, and of an 
alphabetically arranged list of the genera and species. Under each 
specific name is a chronological series of records of the species and of 
all the well-marked varieties. 
Characters of Vaucheria.§— Herr H. Gotz describes the structure 
and various modes of reproduction in the genus Vaucheria , confirming 
the observations of previous writers. He adopts Hansgirg’s classification 
of the species into four groups, viz. : — Corniculatse, Tubuligerae, Pilo- 
boloideae, and Anomalae ; and describes in detail the characters of the 
species belonging to three of them as follows : — (1) Tubuliger®, V. orni- 
* Journ. de Bot. (Morot), x. (1896) pp. 357-67, 388-98 ; xi. (1897) pp. 5-14„ 
24-34, 66-76 (12 figs.). Cf. this Journal, 1896, p. 656. 
f Flora, lxxxiii. (1897) pp. 304-26 (4 figs.). 
t ‘ Index Desmidiacearum citationibus locupletissimis atque Bibliograpliia, 
Berlin, 1896, 310 pp. § Flora, lxxxiii. (1897) pp. 88-134 (55 figs.). 
