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Dixon and Watts on Antarctic Mosses 



Mosses of the Australian Antarctic Expedition, 1911-14, by Mr. 

 H. N. Dixon and Rev. W. W. Watts. Sydney, 1918. (Series C, Vol. VII, 

 Part I). 



In the introduction to this Part, Rev. W. W. Watts regrets that the rare 

 herbarium of M. Jules Cardot has "fallen a prey to the Germans," his residence 

 city, Charleville, being within the war zone. Cooperation was therefore sought 

 of Mr. H. N. Dixon, the well-known British bryologist. 



The material dealt with was collected in Queen Mary's Land, on the Ant- 

 arctic Circle, between 90° and 100° E. longitude. 



The species reported are: 



1. Ceratodon purpureus (L.) Brid., forma. 



2. Sarconeuron glaciale (Hook. f. & Wils.) Card. & Bryhn, a distinctive 

 antarctic moss. 



3. Grimmia fastigiata Card. 



4. Grimmia stolonifera C. M. 



5. Bryum antarcticum Hook. f. & Wils., forma. 



Mr. Dixon recognizes four forms of this Bryum: one of these he refers to 

 Bryum austro-polare Card.; another to B. Gerlachei (Card.) Card., or filicaule 

 Broth. In a letter cited Mr. Dixon suggests, as probably other synonyms, 

 B. inconnexum Card., B. austro-polare Card., and B. algens Card. 



This treatment of Bryum is rather more radical than the author of most 

 of the reduced species would allow. In his Mosses of the Expedition Ant- 

 arctique Beige, Mr. Cardot has minutely described and illustrated, with ex- 

 quisite skill and care, Bryum inconnexum and B. austro-polare (PI. IX), also 

 B. Gerlachei (PI. X). While all the material is sterile and imperfect, Mr. Cardot 

 records that, with reservations, B. inconnexum recalls B. pallens, while B. austro- 

 polare seems to M. Cardot to be near B. turhinatum. However, he admits that 

 certain of the plants referred to B. austro-polare, by their flagelliform shoots, 

 resemble B. Gerlachei. And while Mr. Dixon may in this case have gone a little 

 far afield from conservatism, the constant addition of "new species" to the 

 already enormous list of Bryums makes this a welcome initial departure to 

 anyone who tries to determine any, especially sterile, Brya. 



John M. Holzinger 



Winona State Normal School, Winona, Minn. 



EXCHANGE DEPARTMENT 



Offerings — To members of the Sullivant Moss Society only. Sufficient 

 return postage should be sent. 



Prof. A. C. Herre, Bellingham State Normal, Bellingham, Washington, 

 offers the following: 



Arthopyrenia halodytes (Nyl.) Wed. 

 Caloplaca cerina (Ehrh.) A. Zahlbr. 



