306 SUMMARY OF CUKRENT RESEARCHES RELATING TO 



The paper begins with short accounts of the anatomical structure, the 

 reproductive organs, the systematic position, Chantransia stage, biological 

 conditions, and distribution. Then follow a key to the fifteen species 

 recorded for Sweden, and a detailed description of each species, illus- 

 trated by figures. Two new species of Bat7'achospermum are described. 



Studies of Marine Algas.* — P. Kuckuck publishes four more con- 

 tributions on marine alg8S. 10. New investigation of Nemoderma 

 Schousboe. Having obtained fresh material from the original locality, 

 Agla, near Tangier, he is able to give a detailed account of the structure 

 of the thallus, of the asexual sporangia, antheridia, and oogonia, and also 

 of the biology of the alga. Its systematic position is difficult to fix ; 

 it seems best placed in the Myrioneme^e. 11. Reproduction of the 

 Ph^osporeas. This treats of the swarm-spores and conjugation in 

 Ectocarpus siiiculosus, Scytosiphon lomenfarius, Fhyllitis zosterifolia ; 

 also 01 the anatomy and sporangial formation of Lithoderma fatiscens ; 

 and gives short notes on the reproduction of sundry other Phasophyce^. 

 12. PJatoma ^'«/n/?"», originally found in Massachusetts, is recorded from 

 the east of England and from Heligoland. Kuckuck describes the 

 structure of this Floridean alga, its tetraspores, carpogonia, etc. The 

 plant has a basal thallus from which the filaments shoot up ; and this 

 crust-like thallus can bear tetrasporangia as also the upright filaments 

 do. There is no definite separation into crust-plants with tetraspores 

 and upright plants with sexual organs. 13. Investigations of Ghry- 

 symenia. Kuckuck obtained three species, C. microphysa^ C. uvaria^ 

 and C. ventrkosa^ and gives a close account of their anatomy and 

 reproduction. The first of the three species was barely known hitherto. 



Marine Algae of the Isle of Man Area.t — ^R. J. Harvey-Gibson, 

 M. Knight, and H. Coburn publish a list of the marine alga3 of the 

 Isle of Man area, excluding Cyanophyceae and Diatomacege. The 

 district includes the Mersey and Dee estuaries, Hilbre Island, Anglesea 

 Island, Puffin Island, and the Isle of Man. Sixty- eight additions are 

 made to the alg^ of the Isle of Man. A note is given describing 

 gametangia for Isthmoplea spltserophora \ and another note criticizes the 

 conclusions of Yamanouchi as to the constant alternation of sexual and 

 asexual stages in Polysiphonia violacea. 



Kelps of the United States and Alaska. | — AV. A. Setchell has written 

 Appendix K, on Kelps, in the Government Report on the Fertilizer 

 Resources of the United States. The Report discusses the phosphatic, 

 nitrogenous, and potash fertilizers, their sources, manufacture, control, 

 etc. The bulk of the report is occupied by appendices written by 

 experts. Setchell treats of the Kelps, their conditions of life from all 

 points of view, their special morphology, classification, economic aspect, 

 manufacture-products, etc. Not only the morphological section but the 



* Wissensch. Meeresunt., v.Heft 3 (Kiel and Leipzig, 1912) pp. 117-228 (10 pis. 

 and figs.). See also Engler Bot. Jahrb., xlix. (1913) Literaturber, pp. 18-20. 



t Trans. Liverpool Biol. Soc, xxvii. (1913) 20 pp. (1 pi.). 



X Fertilizer Resources of ■ the United States. Sixty-second Congress. Senate, 

 Document No. 190 (Washington, 1912) 290 pp. (19 pis., 19 maps, and figs.). 



