ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 593 



Phyllitis hybrida.*— V. Vouk discusses the ecology of Phyllitis 

 Injbriila, which is not, as Morton considers, a typical shade- and damp- 

 loving plant, but a mesophyte with distinctly developed xerophytic 

 adaptations. Pevalek and the author found this species, which is en- 

 demic on the southern Quarnero Islands, growing in masses on rocks 

 exposed to the sun, and in winter to the direct Bora on the north-east 

 coast of the island of Pago. The specimens were small and compressed, 

 with a coriaceous frond, and covered on the lower surface with scales. 

 The plants which had penetrated deeper into the rock clefts were larger 

 aud less coriaceous. But those were only shade forms, never damp- 

 loving forms. It is difficult to say which of the two forms, light or 

 shade, is the original. On the same rocks grow specimens of Phillyrea 

 and Paliurus deformed by the wind. Other forms grow in the rock 

 crevices. 



Pteridophyta of New Caledonia.f — Roland Bonaparte gives an 

 account of the Filicales (ninety species) and Lycopodiales (eight species) 

 collected by F. Sarasin and J. Roux in New Caledonia and the 

 Loyalty Islands in 1911-12, including one new variety. H. Schinz has 

 determined the only Equisetum contained in the collection ; and G. 

 Hieronymus records four species of Selaginella, all collected in New 

 Caledonia, and adds some critical notes upon their affinities. 



Bryophyta. 

 (By A. Gepp.) 



Spermatogenesis in Mnium.ij: — W. L. Woodburn gives an account 

 of spermatogenesis in Milium affine var. ciliare, with the following 

 summary : — 1. Resting stages of the spermatogenous tissue show the 

 usual disposition of chromatin and cytoplasm. There is a very prominent, 

 densely staining nucleolus, separated from a surrounding chromatin 

 network by a clear area. The cytoplasm may be evenly and smoothly 

 granular, or slightly flocculent. 2. As the nucleus enters the prophase 

 of division the nucleolus stains more faintly, while immediately outside 

 of the surrounding clear region the chromatin aggregates more densely. 

 A coarse reticulum is formed which passes over into a clearly defined 

 spireme. From the latter six chromosomes are differentiated. ?>. So 

 far as observed, the nuclear division proceeds in the usual manner with- 

 out the accompaniment of polar bodies or plates. 4. The cell-plate 

 seems to be formed in the usual way through cytoplasmic activity in the 

 equatorial region of the spindle ; and the daughter-nuclei are reorgan- 

 ized by passing through stages corresponding to those of the prophase, 

 but in the reverse order. 5. No diagonal division was found to occur 

 in either Mnium or Polytrichum. This makes it rather difficult to 



* Oesterr. Bot. Zeitschr., lxv. (1915) pp. 41-3. See also Bot. Centralbl. cxxix. 

 (1915) p. 261. 



t F. Sarasin and J. Roux, Nova Caledonia Botanique. I. Wiesbaden: Kreidel, 

 1914, pp. 35-65 (3 pis.). 



X Ann. Bot., xxix. (1915) pp. 441-56 (1 pi.). 



