594 SUMMARY OF CURKENT RESEARCHES RELATING TO 



on the same plant. Two charts show the tidal relations to the crops of 

 Dictyoia at Bangor and Beaufort respectively. 



Anatomy of Phyllophora nervosa.* — W. N. Kononow gives an 

 account of the anatomy of PliyUophora nervosa Grrev., collected on the 

 Chorly peninsula, in the Gulf of Karkenit. He treats of the habitat 

 and habit of the plant ; the formation of branches ; assimUatory and 

 mechanical tissues ; storage-tissue and conducting-tissue. It requires 

 special conditions for its growth ; where the muddy clay gives way to 

 firm shelly bottom, there the plant grows at a depth of 2-3 m. ; and 

 it can endure but little variation in its environment. Growth takes 

 place by means of a three-sided apical cell. The assimilatory tissue is 

 very early marked about 0*1 mm. from the apical cell. The chromato- 

 phores occur, not in the cortical tissue, but in the deeper layers of the 

 assimilatory tissue. The whole alga is covered with a pectinous material. 

 The mechanical tissue consists of a system of external buttresses, which is 

 most developed near the base. The storage and conducting tissue 

 occupy the innermost part of the thallus. The shapes of the different 

 cells are described, with the pores in the cell-walls. 



Polysiphonia.f — A. de Toni has made a study of 18 species of 

 Polysiphonia, hitherto unpublished or but little known, from the herbaria 

 of Zanardini and Meneghini. He publishes a diagnosis of each species, 

 with a note as to its affinities, etc., giving at the same time the place and 

 herbarium where the respective original specimens are preserved. This 

 is in most cases the herbarium of G. B. de Toni, at Modena. Seventeen 

 of the species are from the Adriatic and one from Tasmania. 



Antarctic and Sub-antarctic Corallinacese.| — M. Foslie describes 

 the calcareous algte brought home by the Swedish Antarctic Expedi- 

 tion, 1901-3, collected by C. Skottsberg. The collection contains 13 

 species, of which 7 belong to the genus Lithothamnion (2 being new), 

 4 to Lithophyllum (1 being new), 1 is an Amphiroa, and 1 a CoralUna. 

 The greater number of specimens were found at Staten Island, a few 

 in the Beagle Channel, Fuegia, besides several from the Falkland 

 Islands, South Georgia, and one from Louis Philippe Land. In a short 

 introduction the author deals with the distribution of Lithothamnion and 

 Lithophyllum in the antarctic region, so far as is possible from the material 

 at his command ; and he points out the various affinities between the 

 antarctic species and those from other parts of the world. Two species 

 which occur at the Falklands are so closely connected with two South 

 African species, that the author was in the case of one species disposed to 

 consider the differences as merely varietal. Critical notes are appended 

 to each record. 



New and Critical Coralline Alg'8e.§ — M. Foslie publishes diagnoses 

 and critical notes on a number of species of Lithothamnion, Archoeolitho- 

 thamnion, Goniolithon, Melohesia, Litholepis, and Lithophyllum. They 

 come from all parts of the world, and include a few species collected by 



* Scripta Bot. Hort. Univ. Imp. Petropol, xxiii. (1905-6) pp. 106-14 (1 pi.). 

 t Nuov. Notar., xviii. (1907) pp. 153-68. 



i Wiss. Ergebn. Schwed. Siidpolar Exped., 1901-3, iv. lief. 5 (1907) 16 pp., 2 pis. 

 § Kgl. Norsk. Vidensk. Selsk. Skrift. 1906, No. 8 (1907) 34 pp. 



