ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 653 



Spermatogenesis in the Bryophyta.*— M. Wilson gives an account 

 of spermatogenesis in the Bryophyta, with the following conclusions. 

 1. In Minium /ionium and Atrichum u ml u latum the divisions of the 

 spermatogenic cells are normal, and no centrosomes are present. The 

 final division is not of the diagonal type which is found in several of 

 the hepaticaj. No reduction in the number of the chromosomes takes 

 place at the final mitosis. 2. In Pellia epiphylla centrospheres and 

 probably centrosomes are present during the later divisions in the 

 antheridium. The blepharoplast is probably derived directly from the 

 centrosome. 3. In the spermatid of Milium hornum a number of 

 bodies become separated from the nucleolus. These pass into the 

 cytoplasm and there give rise to a number of rod-like structures, which 

 by coalescence finally form a hollow spherical body, for which the name 

 " limosphere " is suggested. The nucleolus then divides into two 

 masses, which both pass into the cytoplasm ; one of these functions as 

 the blepharoplast, while the other gives rise to the accessory body. 



4. In the spermatid of Atrichum undulatum three bodies are separated 

 from the nucleolus and pass into the cytoplasm. The body first pro- 

 duced functions as the blepharoplast. The limosphere arises from one of 

 the remaining bodies, while the other gives rise to the accessory body. 



5. In Pellia epiphylla a limosphere and accessory body are present in 

 the cytoplasm of the spermatid. Their origin was not determined. 



6. In all of the three plants under consideration the blepharoplast 

 passes to the periphery of the spermatid. A thread-like structure is 

 produced in connexion with the blepharoplast, which passes along the 

 inner contour of the cell membrane. The nucleus passes to the 

 periphery and lies in contact with the thread. Elongation takes place 

 in the nucleus, and the latter, together with the thread, produces the 

 entire body of the spermatozoid. The limosphere and accessory body 

 persist in the almost mature spermatozoid, and in all probability are 

 found ultimately in the vesicle. 



Mosses attacked by Cladosporium.— I. Gyorffyf gives an account 

 of some Hungarian specimens of Buxbaumia viridis which were attacked 

 by a fungus, identified as Cladosporium herbarum by L. Hollos. The 

 fungus densely permeates the interior of the capsule and forms stellate 

 spots on the outside. The measurements do not appear to correspond 

 with those of C. epibryum Cooke and Massee. 



E. Gr. Britton,! m reference to the above, gives a list of the eight 

 mosses upon which Cooke and Massee found C. epibryum, all American 

 species sent by her to those authors for examination. 



Nomenclature of Sphagnacea3.§— C. Warnstorf publishes a detailed 

 reply to the suggestions advanced by J. Roll in favour of alterations of 

 and additions to the Vienna code as regards the nomenclature of Sphag- 

 naceae. Warnstorf, holding orthodox views, protests energetically 

 against the views expressed by Roll as to the limitation of species and 

 the grouping of forms. 



* Ann. of Bot., xxv. (1911) pp. 415-57 (2 pis.). 



t Bryologist, xiv. (1911) pp. 41-3 (1 pi.). 



t Mycologia, iii. (1911) p. 206. 



§ Verh. Bot. Ver. Prov. Brandenburg, Hi. (1910) pp. 22-38. 



Oct. 18th, 1911 2 D 



