IQ2 NOTES AND MEMORANDA. 



The author describes and figures a few abnormalities in 

 some Desmidian species, consisting of the interposition of a 

 monstrous growth between the semicells, without any sub- 

 sequent constriction or division, and of misshapen lobules 

 in the wrong place, mimicking those that occur normally 

 in other situations. Such monstrosities now and again 



turn up. . „ . 



In Fungi several new genera are established for curious 

 forms occurring on and in the stems and leaves of mosses, 

 ou algse, &c. 



The author adds not less than 131 plates, contaimng 

 figures of all the new species described in the work. These, 

 if not finely done, are graphic and expressive, and, together 

 with over 100 quarto pages of letter-press, containing the 

 various descriptions, form a valuable record of long and 

 patient and successful labour; and the work will be no 

 doubt welcome to cryptogamic botanists in this country. — 

 Wm. Archer. 



Change of Editorship.— Professor W. T. Thiselton Dyer has 

 found it necessary to retire from the joint editorship of this 

 Journal in consequence of his appointment as Assistant 

 Director of the E-oyal Gardens, Kew. His place on the edi- 

 torial staff is taken by Mr. William Archer, F.R.S., of 

 Dublin, well known to the readers of this Journal. 



Professor Cohn's Beitrage ; — Bacterium rubescens. — We have 

 received the third part of the contributions to botanical physi- 

 ology, published under Professor Cohn's direction by Kern, at 

 Breslau, 1875. At present we are not able to give an account 

 of the contents, except to mention that it contains several 

 important communications relating to the Bacteria, besides 

 other papers on Volvox, Utricularia, and Aldrovanda by 

 Professor Colin. Professor Lankester wishes to state that he 

 is not convinced by the evidence adduced by Cohn of the 

 correctness of a separation of the forms included under Bac- 

 terium rubescens into the two species Clathrocystis roseoper- 

 sicina and Monas okeni. The flagellum ascribed by Colin to 

 Monas okeni (the large Bacterioid plastids oi B. rubescens) is 

 parallelled by the flagella of B. ternio, described by Dallinger 

 and Drysdale. Professor Lankester had observed the appear- 

 ance of a flagellum as described by Cohn in this form on 

 treatment with iodine or magenta solution, but had not been 

 (and is not now) able to satisfy himself that the apparent 

 flagellum is really part of the plastid to which it is attached, 

 since in the fluid, together with the red-coloured plastids, 

 are always found very numerous filamentous forms (Bacillus 

 and Vibrio) of great delicacy and length, which by acci- 



