ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 719 



during the winter, and begin to germinate there in March. In April 

 the seta lengthens and the spores are scattered. The structure of the 

 thallus is described in detail — the upper epidermis and spores ; the air- 

 chamber, or assimilating layer ; the store-house, or conducting tissue, 

 with its mucilage-canals ; the lower epidermis, rhizoids, scales, and oil- 

 bodies. Then follow the structure and development of the male and 

 female organs, fertilisation, development of sporogonium, germination 

 of spores, and development of the thallus. Vegetative reproduction 

 consists of the production of adventive shoots and of large gemma?, and 

 is fostered by moisture and darkness, whereas the production of sexual 

 organs depends upon drier conditions and an excess of illumination. 



On the Distribution and Mode of Life of Exormotheca.* — K. 

 Goebel has discovered the existence of this genus of Marchantiaceas in 

 South Italy, either in Ischia or at Amalfi (he is not certain which). 

 The results of his study of the specimens are described and figured. 

 The thallus is 2-4 mm. broad and is forked, the branches not much 

 exceeding 5 mm. It shows the chimney-like air cavities characteristic 

 of the genus, and is either E. })ustulosa or a very closely allied species. 

 The antheridia are figured, but the author had no specimen showing 

 archegonia. The thallus has a number of mucilage cells (Schleimzellen) 

 distributed in a peculiar manner. The plant belongs to the tuber- 

 forming liverworts ; the tubers arise partly as ventral shoots on the mid- 

 rib (where otherwise no shoots arise), partly as thickenings of the 

 apical portion of the thallus. 



Mosses of the Jura.j — C. Meylan has published a catalogue of the 

 mosses of the Jura. He gives a brief account of the work of previous 

 collectors, and indicates the regions which still remain to be explored. 

 He adds a general sketch of the moss-flora of the Jura, and an analysis 

 in which the species are grouped according to their habits and altitudes. 

 In the catalogue proper the species are classified according to Limp- 

 richt's Laubmoose, and furnished with notes about their habitats and 

 distribution. 



Anderson, J. P. — Thalloid Liverworts of Decatur County. 



Iowa Nat., i. (1905) pp. 33, 44. 



Bloompield, E. N. — Fauna and Flora of Norfolk ; Additions to Hepaticae. 

 [List of 19 species, 3 of which are new records for the county.] 



Trans. Norfolk and Norwich Nat. Soc, viii. (1905) pp. 148-9. 



Cardot, J. & I. Theriot. — New or unrecorded Mosses of North America. 



[Four species of Bryum.~] Bryologist, viii. (1905) pp. 95-6. 



Chamberlain, E. B. — Notes upon Maryland Bryophytes and on two Mosses from 

 Virginia. 



[Notes on 6 mosses and on 2 hepatics from the vicinity of Washington.] 



Tom. cit., pp. 77-8. 



Coker, W. C. — Spore distribution in Liverworts. Tom cit., p. 93. 



Dixon, H. N. — Nematode Galls on Mosses. 



[Formed by Anguillulae on Porotrichum alopecurum and EurhynchiumSwartzii.~] 



Journ. of Bot., xliii. (1905) pp. 251-2. 



* Flora, scv. (190;")) pp. 244-50 (8 figs, in text). 

 t Bull. Soe. Vaudoise, xli. (1905) pp. 41-96. 



