ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 83 



species are described, and these and three other rare species are figured 

 in detail. Some critical notes are appended to the more difficult species. 

 R. S. Williams * gives a list of 230 mosses collected by him in the 

 Yukon territory during a residence of more than a year (1898-9). A 

 new genus with one new species, Bryobrittonia pellucida, closely related 

 to Tortula and Desmatodon, is established ; and ten other new species 

 are described. Numerous critical notes are interspersed. B. M. Britton f 

 records the first discovery of the rare Buxbaumia indusiata in New 

 England. It occurred in quantity on a rotten log of poplar at Surry, 

 New Hampshire. It is usually found as a saprophyte on decayed coni- 

 ferous logs. It is known from four other localities in the United 

 States. J. F. Collins % publishes some critical and distributional notes 

 on Hypnum Richardsoni, Anacamptodon splachnoides, Catoscopium 

 nigritum, and other mosses in connection with the New England flora. 



South American Mosses.§ — P. Dusen gives an account of the 

 Sphagnacea? and Andrea3acea3 collected by himself and by 0. Norden- 

 skjold and F. W. Neger in the neighbourhood of the Straits of Magellan, 

 in west Patagonia and south Chili, with descriptions and figures of 

 seven new species and two new varieties, and critical notes as to their 

 affinities. The Sphagnaceae attain their highest development in the 

 regions of the deciduous and evergreen forests ; of the commoner 

 forms two varieties of S. medium form bogs, and a variety of & 

 fimbriatum occurs in large loose cushions in open country. 



Germination of Liver-worts. || — E. Lampa publishes some well 

 illustrated studies on the germination of Preissia, Reboulia, Plagio- 

 chasma, FegateUa, Fossombronia and Anthoceros from their spores, and 

 considers that the development of the sexual generation can be divided 

 into several stages. The germ-tube is a protonema usually of limited 

 growth. The rudiment of the stem arises from segmentation of the 

 terminal cell, the apical cell arising from the third segment, the plan of 

 this process resembling that of moss-gemma3. The embryo is highly 

 sensitive to the direction and intensity of the incident light. Leaves 

 do not appear in Anthoceros, and are more or less rudimentary in 

 Marchantiacese. In FegateUa, though absent in the rudimentary stage,, 

 they appear later as under-leaves. Three rows of well-developed leaves 

 are produced in the vertically growing Haplomitrium. They are present 

 in other Jungermanniaceas. Anthoceros holds a leading position in 

 virtue of its highly developed asexual generation, though the sexual 

 generation appears very reduced as compared with the Jungermanniaceae, 

 the Marchantiacea3 occupying an intermediate position. In the rudi- 

 ment of the stem are signs of reduction which approach the typical 

 development of the moss-stem. 



Development of Riella.1T— M. P. Porsild gives the results of his 

 investigations of this aquatic genus. Starting with a historical and 

 geographical survey of the species, he supplies a comparative table of 



* Bull. New York Bot. Garden, ii. (1903) pp. 105-48 (10 pis.), 

 f Bhodora, v. (1903) pp. 257-S. \ Tom. cit., pp. 199-201. 



§ Arkiv. lor Botanik. Stockholm, i. (1903) pp. 441-65 (11 pis.). 

 I| SB. Akad. Wiss. Wien, cxi. (1902) pp. 477-89 (5 pis). 

 If Flora, xcii. (1903) pp. 431-^6 (8 figs, in text). 



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