186 SUMMAKY OF CURIIENT RESEARCHES RELATING TO 



CufUria. Therefore, the in dividual bearing the name of GutUria mvJ- 

 tifida represents the gametophytic phase of the species, twenty-four 

 being the gametophytic number of chromosomes ; and the Aglaozonia 

 form of CutJeria represents the sporophytic phase, forty-eight being 

 the sporopliytic number. 3. A/jJaozonia rep f am contains forty-eight 

 chromosomes, and the number is reduced in zoospore formation, the 

 zoospore containing twenty-four chromosomes. The zoospore with the 

 reduced number of chromosomes germinates without conjugation. The 

 individual grown from the germinating zoospore presents a striking 

 similarity to the young form of Cutler ia in nature, and contains twenty- 

 four chromosomes, the same number as the latter. Therefore it is 

 evident that the individual bearing the name of Aglaozonia repta/is 

 represents the sporophytic phase of the species, forty-eight being the 

 sporophytic number of chromosomes, and that the gametophytic phase 

 is represented by the individual grown from the zoospore, and resembling 

 the young form of Cutleria in nature. It is certain that A. repta/is^ as 

 it occurs in nature, is identical with the Aglaozonia form of C. muUifida 

 as developed in cultures, and now determined to be the sporophytic 

 phase of the species. 4. Therefore, G. muUifida and A. reptans repre- 

 sent respectively gametophytic and sporophytic generation of a single 

 species, the two generations alternating in the life-history of Gutleria. 

 5. The female gamete of Gutleria may germinate apogamously. There 

 is no irregularity in the mitotic process, twenty-four chromosomes being 

 invariably present. The individual produced in its early development 

 differs somewhat from the product of the fertilized gamete, but the fate 

 of the apogamous individual was not determined. 



Chara foetida.* — H. Losch describes the occurrence of a second 

 involucral sheath on the oogonial bud of Chara fmtida^ arising below 

 the normal sheath, and gives explanatory diagrams of both normal and 

 abnormal oogonial buds. The development of the abnormal cells could 

 not be traced. 



AlgSB of the Adriatic! — J- Schiller gives an account of the 

 botanical results of the cruise of the ' Xajade ' in the Adriatic during 

 the summer of 1911. Both benthos and plankton were studied along 

 the whole eastern shore of the Adriatic, except the well explored gulfs 

 of Triest and of Quarnero ; and excursions were made across to the 

 Italian shore. Lists are given of the algae collected at the various 

 places of call, and of the species obtained by dredge or trawl, with 

 records of the depths from which they all came. The horizontal and 

 the vertical distribution of the species is discussed and illustrated with 

 tables. The biological relation of the species to light, warmth, salinity, 

 purity, etc., of the sea-water is similarly treated. The methods of treat- 

 ing the plankton — separated by net, filter or centrifugalization — is 

 described, and the results are summed up in lists and tables. 



♦ Ber. Deutsch. Bot. GeseU., xxx. (1912) pp. 516-22 (figs.). 



t Oesterr. Bot. Zeitschr., Ixxii. (1912) pp. 359-68, 411-16, 477-95. 



