606 SUMMARY OF CUKRENT RESEARCHES RELATING TO 



to Anmctangium compactum, while GjorfFy, who has examined the 

 original specimen, maintains that it is identical with Molendoa Sendt- 

 neriana. Anatomical and morphological details are shown on a plate. 



Mosses of Amboina.*— Y. F. Brotherus publishes an account of the 

 Mosses of Amboina, based on the collections of the ill-fated Dr. C. B. 

 Robinson, together with species gathered by earlier authors, such as 

 Zippel, Naumann, De Vriese, and Micholitz. The enumeration contains 

 sixtj-five species, including four new species. Had Eobinson been able 

 to complete his exploration, the list would doubtless have contained 

 many more novelties. 



Thallophyta. 



Alg-se. 



(By Mrs. E. S. Gepp.) 



Crossing of One-celled Haploid Org-anisms.t — A. Pascher describes 

 the crossing of two different species of Chlamydomonas which were not 

 identical with any known species. No. I. was narrowly ovate, with, 

 lateral chromatophore and pyrenoid, long cilia, naked gametes, and a 

 roughly sculptured zygote, star-shaped in section, without surrounding 

 coats. No. II. was almost globular, with basal chromatophore and pyre- 

 noid, short cilia, gametes covered with a membrane, and zygotes smooth 

 and surrounded by several coats. Eighty copulations were observed. 

 As regards sculpture, the zygotes stood midway between I. and II., having 

 some surrounding coats, but fewer than in II. Union of the nuclei 

 took place. Cultures were raised from eight of the heterozygotes, five 

 of which merely reproduced the parents ; two of the swarm-spores of 

 each represented I., and two II. The relations of the two classes 

 changed more and more from representing an equal number of both 

 types to a preponderance of type II., caused by the quicker process 

 of division in type II. Type I. takes seventy-two to seventy- six hours, 

 type II. takes forty to forty-five hours to divide. In the three other 

 heterozygotes, four types appeared, namely, one which was very closely 

 allied to I. ; two intermediate forms, and a type which was like II. In 

 the two other cultures, four intermediates were formed. It is to be 

 supposed that each swarm-spore produces a type. In reduction-division 

 a new coml:»ination of characters must, therefore, take place. A fuller 

 account will be published later. 



Dinoflagellates as Originators of Red Snow.| — 0. Suchlandt con- 

 troverts the statement of M. Traunsteiner that Peridiniew are the sole 

 cause of red snow. At the end of December, 1915, an enormous 

 quantity of Glenodimum was observed on the ice at Davos See which 



* Philippine Journ. Sci., Bot., xii. (1917) pp. 73-80. 



t Ber. Deutsch. Bot. Gesell., xxxiv. (1916) pp. 228-42 (5 iigs.). See also Bot. 

 Centralbl, cxxxiv. (1917) pp. 36-7. 



X Ber. Deutsch. Bot. Gesell., xxxiv. (1916) pp. 242-6 (1 pi. and 1 fig.). See also 

 Bot. Centralbl., cxxxiv. (1917) p. 11. 



