ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
503 
M. E. Do Wildeman * describes similar structures in species of 
Mesocarpus, Spirogyra, and Zygogonium, produced under normal con- 
ditions of growth. 
Mode of Attachment of Cladophora.j — M. F. Gay describes the 
mode of attachment to the substratum of two species of Cladophora , a 
character which he thinks will be useful in the discrimination of species. 
In G. glomerata the organ of attachment is a creeping “ rhizome,” con- 
sisting of short branches composed of short round or elliptical cells, 
each of which contains several nuclei. From this rhizome the erect 
branches spring in the ordinary way, and it puts out slender “ rhizines ” 
for further attachment. Containing a large quantity of starch, and 
often protected by a calcareous incrustation, this rhizome serves also 
for the perpetuation of the species during winter. G. fracta possesses a 
similar rhizome, from which, in the variety observed (forma dimorpha ), 
there spring branches much more slender than the ordinary ones, which 
themselves branch, and, breaking off readily from the rhizome, form a 
floating mass of slender filaments which might readily be mistaken for 
a Rhizoclonium. 
Pleiocarpous Species of Trentepohlia.if — M. P. Hariot unites all 
the species of Trentepohlia characterized by a number of stalked zoo- 
sporanges springing from a single large cell, viz. T. uncinata , pleiocarpa , 
and arborum , into one, to which he restores the name T. aurea. 
De-Toni’s Sylloge Algarum. — The first part of the second volume of 
this most important work is just published, consisting of a complete and 
valuable Bibliography of the Diatomaceae by M. J. Deby. The first 
volume (1889), devoted to the Chlorophyceae, contains a description of 
every species of green Algae at present recognized. These are arranged 
under 4 orders — the Confer voideae, Siphoneae, Protococcoideae, and Con- 
jugatae, which are again divided into 25 families, viz. ; — 1, Coleochaetaceae, 
2, Mycoideaceae, 3, CEdogoniaceae, 4, Cylindrocapsaceae, 5, Sphaero- 
pleaceae, 6, Dlvaceae, 7, Ulotrichaceae (Ulotricheae, Chaetophoreae, Con- 
ferveae), 8, Chroolepidaceae, 9, Hansgirgiaceae ( Hansgirgia flabelligera), 
10, Cladophoraceae (Cladophoreae, Spongocladieae, Microdictyeae, Ana- 
dyomeneae, Valonieae), 11, Pithophoraceae, 12, Gomontiaceas ( Gomontia 
polyrMza ), 13, Yaucheriaceae, 14, Dasycladaceae (Dasvcladeae, Aceta- 
bularieae), 15, Derbesiaceae, 16, Bryopsidaceae, 17, Caulerpaceae, 18, Spon- 
godiaceae, 19, Udoteaceae, 20, Hydrogastraceae ( Botrydium granulatum ), 
21, Phyllosiphonaceae ( Phyllosiphon Arisari), 22, Yolvocaceae (Yolvoceae, 
Spondylomoreae, Haematococceae, Cylindromonadeae), 23, Palmellaceae 
(Coenobieae, Pseudocoenobieae, Eremobieae, Tetrasporeae, Dictyosphaerieae, 
Nephrocytieae, Coccaceae), 24, Zygnemaceae (Mesocarpeae, Zygnemeae), 
25, Desmidiaceae. Of CEdogonium 189 species are enumerated, of Gla- 
dopliora 229, of Gaulerpa 80, of Spirogyra 81, of Glosterium 103, of 
Cosmarium 308, of Staurastrum 250. A complete phycological biblio- 
graphy is appended. 
* CR. Soc. Roy. Bot. Belgique, 1891, pp. 35-9 (3 figs.). 
f Journ. de Bot. (Morot), v. (1891) pp. 13-6 (3 figs.). 
X T. c., pp. 77-8. Cf. this Journal, 1890, p. 490. 
