ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
233 
Algae. 
New Genera of Algae.* — Dr. H. Klebalm describos two new genera 
of Algae, viz. : — 
Dicoleon . — Filamenta articulata, ramosa, in muco valde evoluto sub- 
bemisphaerico vegetantia efc quasi tballum disciformem formantia, ramis 
repentibus pluricellularibus praedita ; cellules arete in filamenta concretae 
et praeterea utriculis brevissimis aretis conjunctae, partim in dorso 
setigerae ; setae longissimae, vaginis duabus, altera longa tubuliformi, 
altera quae est externa brevissima, in inferiore parte circumdatae. 
Dicoleon Nordstedtia , mixed with Aphanochsete globosa f. major. 
Conochsete. — Cellulae in filamenta non conjunctae, in mueo valde 
evoluto subgloboso v. subhemisphaerico vegetantes ; cellulae filiae post 
divisionem membranis cellulae matris extensis inclusae. sed mox muco 
separatae ; membranae in setas plures longissimas caducas, vagina conica 
gelatinosa in basi praeditas, productae. C. polytricha (Aphanochsete poly - 
tricha Nordst.), and G. comosa sp. n. This genus belongs to the 
Palmellaceae. 
He further gives a new diagnosis of Aphanochsete (which generic 
name he considers must stand, to the exclusion of Hansgirg’s Her- 
posteiron ), and of Chsetosphseridium , from which Nordstedtia Borz, is 
quite distinct. 
Prof. A. Hansgirgf criticizes various points in this paper; and 
Dr. Klebahn J rejoins. 
Polymorphism of Trentepohlia.§ — Herr K. Deckenbach claims to 
have proved by cultivation the identity of Trentepohlia lagenifera , aurea , 
and umbrina, which he unites into one species with the name T. poly- 
morpha . T. umbrina was taken in winter and cultivated. At first some 
of the cells became sporanges with red zoospores. The cells then began 
to divide and to develope into filaments, the red pigment becoming at 
the same time transformed into chlorophyll. Some of the cells assumed 
a red colour, and developed into pear-shaped zoosporanges, and the plant 
was typical T. aurea. In the beginning of the summer the whole plant 
again became green, formed flask-shaped sporanges, and was then T. 
lagenifera. In July the colour became a deep orange; the terminal 
cells of some of the branches became thick-walled and hemispherical, an 
ovate sporange being finally abstricted from the apex. The plant is 
transformed into Chroolepus uncinatum. 
Fungi. 
Composition of the Cell- wall of Fungi. — From observations made 
on fungi belonging to a large number of different classes : — Perono- 
sporaceee, Saprolegniacese, Mucorini, Uredineae, Ustilagineae, Basidio- 
mycetes, Ascomycetes — M. L. Mangin || observes that the terms fungine, 
metacellulose, and fungus-cellulose are misleading, as implying the 
existence of a single substance in all fungi, which is not the case. 
* Jahrb. f. wiss. Bot. (Pringsheim), xxv. (1893) pp. 278-321. Cf. this Journal, 
1893, p. 361. f Bot. Centralbl., lvi. (1893) p. 31. I Tom. cit., p. 323. 
§ Script. Bot., 1893, 16 pp. and 1 pi. See Bot. Centralbl., lvi. (1893) p. 77. 
|| Comptes Reudus, cxvii. (1893) pp. 816-8. i 
1894 ' B 
