328 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the young apices manage to break away to the surface of the water. 

 The apices have great plastic capacity. The sporophyte is liable to 

 attack by an Ustilagineous fungus. 



Mycorrhiza of Liver-worts. — Anton J. M. Garjeanne* has examined 

 the mycorrhiza found in the rhizoids of a great many hepatics, and 

 concludes that they are more of the nature of parasites than of symbionts. 

 The fungus penetrates the rhizoid from the soil, and the invaded cells 

 become more or less disorganised. Many examples were found to be 

 entirely free from hyphae and yet growing vigorously. The author thinks 

 that in these lower plants mycorrhiza is of less importance than in the 

 higher forms. 



B. Nemecf discusses the relation of the mycorrhiza to its host in 

 Calypogeia trichomanis. He points out that it is found only in the short- 

 lived rhizoids, that it enters them from the outside and never from the 

 hepatic thallus, that it forms pscudoparenchymatous swellings in the 

 rhizoid initials, and may throw out haustoria into neighbouring cells but 

 spreads no further, being kept at bay by the vitality of the host. Its 

 presence in, or absence from, the hepatic appears to depend upon the 

 habitat of the latter. While the mycorrhiza benefits by the symbiosis,, 

 the hepatic appears neither to benefit nor to suffer by its presence, so far 

 as the author can determine. 



Patagonian Hepatics.!— A. W. Evans gives an account of the 

 53 hepatics gathered by J. B. Hatcher on the south coast of Tierra del 

 Fuego, and in Patagonia by J. B. Hatcher in 1896-7. Two new species 

 and some rare and incompletely known forms are described and com- 

 mented upon. A supplementary list of all known hepatics from the 

 region of the Magellan Straits is added. 



Barker, T. — Note on Tortula rigida Schrad. and Tortula brevirostris Hook, and 

 Grev. 



[A doubt as to whether these are really distinct species.] 



Bev. Bryol., xxxi. (1904) p. 23. 



Bauer, E.— Musci Europaei exsiccati, series I. Prague, 1903, 16 pp. 



Ben a, M.— Die Laubmoosfiora des Ostrawitzatbales. (Moss-flora of the Ostra- 

 witzathal.) 



[An annotated list of 240 species, 10 of which are new to Moravia and Silesia.] 



Verh. naturf. Ver. Briin>\ xli. (1903) pp. 3-27. 



Blind, C. — Note complementaire sur les Sphaignes de la region jurassienne. 

 (Supplementary note on the spbagna of the Jura.) 



Bull. Soc. Nat. Ain, 1903, pp. 16-18. 



Bottini, A. — I primi Muschi delle isole Eolie. (The first Mosses of the ^Eolian 

 islands ) 



[Filty-eigU species.] Bull Soc. Bot. Ital,, 1903, pp. 294-9. 



Brotherus, V. F.— Musci Hawaiici, quos legit D. D. Baldwin. (Mosses of the 

 Sandwich I.-lands, collected by D. D. BaldwiD.) 



[List of 163 species, of which 74 species and 5 varieties are new.] 



Op. cit., 1904, pp. 14-25. 



* Beih. Bot. Centralbl., xv. (1903) pp. 471-82 (10 figs.). 



t Op. cit., xvi. (1904) pp. 253-68 (.1 pi.). 



X Princeton Univ. Exped. Patagonia, viii. (1903) pp. 35-62 (3 pis.). 



