ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 81 



Marcliantiacea3 they are complicated or absent. And corresponding 

 with tliese respectively are various;types of cavities. These are specified 

 and instanced with some detail. 2. The solid parenchyma stratnm 

 varies much in importance, being reduced to three tiers of cells in 

 Ricciocarpus, and reaching considerable thickness in the higher Mar- 

 chantiace^e, in some species containing mucilaginous canals, and in one 

 sclerified cells. 3. Scales in the Ricciacea3 are either present, caducous, 

 or absent. In the Marchantiacese they are of various sorts, and examples 

 of them are cited. In conclusion, the author states that these anatomical 

 peculiarities are sufficient for distinguishing not only genera, but even 

 species. The air-cavities and ostioles in particular are of prime import- 

 ance. For the Ricciace^e it is sometimes necessary to study young 

 plants. 



Antheridial Development in Polytrichum.* — C. E. Allen publishes 

 a critical paper on the cell-structure, growth, and division in the 

 antheridium of Polytrichum Juniperinum. He gives a detailed descrip- 

 tion of the structure and division of the antheridial cells. He introduces 

 some new terms : for instance, the cells which are to be metamorphosed 

 into spermatozoids are called androcytes ; those of the penultimate 

 generation as androcyte mother-cells ; and those of all the earlier genera- 

 tions as androgones. A resume of cytological work in the Bryophyta 

 and an extensive bibliography are added. 



Atrichopsis.t — J- Cardot publishes a description of AiricJiopsis, a 

 new genus of Polytrichace^, collected by the Swedish Antarctic Ex- 

 pedition in South Patagonia, Tierra del Fuego, and Falkland Islands, 

 and about 70 years ago by Sir Joseph Hooker in Hermite Island. 

 Cardot has found in an original tuft of Folytriclium compressum Hook, 

 fil. and Wils. the three species — Psilopilum compressum, P. aniarticum, 

 and AtricJiopsis magellmiica. Atrichopsis is distinguished from all other 

 Polytrichace^e by having densely papillose leaves. In its bistratose 

 border and elamellate leaves it approaches Alophosia, but differs in having 

 differentiated marginal cells, and a calyptra hispid above and glabrous 

 below. ^ 



Eucladium verbanum4 — H. N. Dixon gives an account of the 

 morphological and anatomical characteristics of Eucladium verdcinum, a 

 new and peculiar calcicolous species gathered at Baveno and Lugano. 

 He adds a critical discussion of the question whether the plant should 

 be referred to the genus Eucladium. 



Marsupella apiculata.§ — AV. E. Xicholson records the occurrence of 

 Marsupella apiculata Schiffn. in Britain. It was found near patches of 



* Arch. f. Zellforsch., viii. (1912) pp. 121-88 (4 pis.). See also Bot. Gaz., liv. 

 (1912) pp. 429-31. 



t Rev. Bryolog., xxxix. (1912) pp. 95-6. 



I Rev. Brvolog., xxxix. (1912) pp. 89-92 (figs.). 



§ Journ. of Bot., 1. (1912) pp. 367-8. 



Fch. 19. 1913 G 



