634 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Chemical Constituents of Lichens. — P. Rave * re-examines the work 

 on Evernia furfuracea by Zopf, who had decided that this lichen was the 

 representative of a new genus, Pseudevernia, and who had split it into six 

 species. Elenkin questioned the correctness of Zopf's theories. Rave has 

 taken up the question, and uphold's Zopf's views ; he finds morphological 

 as well as chemical differences between the different species. 



Emmanuel Senft f writes on the occurrence of physcion and parietin 

 in lichens. They are insoluble in water, but can be easily extracted with 

 alcohol, chloroform, etc., and they crystallise ' in characteristic forms. 

 Coloured tables are given showing the forms of the crystals. 



Beitzelmayr, Max. — Die Cladonien des Harzgebietes und Nordthiiringens 

 nach dem " Herbarium Oszwald." (The Cladonien of the Harz and North 

 Thuringia according to Oszwald's Herbarium.) 

 [A collection of about 300 specimens of Claclonite.~\ 



Beih. Bot. CentralbL, xxiii. (1908) pp 318-23 (V pis.). 



Elenkin, A. — Lichenes florae Russicae Mediae, Fasc. ii., Nos. 51-100. 

 [A varied selection of lichens from Central Russia.] 



St. Petersbourg, 1907. See also Bot. CentralbL, cvii. (1908) p. 492. 



Hasse, H. E. — Lichens collected in the Tehachepi Mountains, California, June 

 1907. 



[A considerable list of plants is given, with instructive notes on some of the 

 species.] Bryologist, xi. (1908) pp. 55-7. 



Howe, Heber Reginald — Lichens of the Mount Monadnock Region, N.H., 

 No. 2. 



[Several forms of Thelochistcs are discussed and compared.] 



Tom. cit., p. 74. 



To bleb, F. — Kritische Bemerkungen uber Rhaphiospora, Arthroraphis Myco- 

 bacidia. 



[Critical notes on various lichens.] 



Hedwigia, xlvii. (1908) pp. 140-4 (2 figs.) 



Zahlbruchner, A. — Neue Flechten. (New lichens.) 



[Diagnoses of species from Patagonia, California, 

 Chili, Herzegovina, and Steierrnark.] 



Ann. Mycol., vi. (1908) pp. 129-34. 



,, ,, New North American Lichens. 



[New species described from Arizona ; all of them 

 collected from basaltic rocks.] 

 Bull. Torrey Bot. Club, xxxv. (1908) pp. 297-300. 



Mycetozoa. 



(By A. Lorrain Smith, F.L.S.) 



Notes on Swiss Mycetozoa.J — A. and Gr. Lister report on a series 

 of forms collected on high ground, most frequently in the neighbourhood 

 of melting snow. They note certain variations, due apparently to their 

 Alpine surroundings : great variation iu the size and shape of sporangia, 

 etc., which other observers have also remarked. They publish a new 

 variety of Physarum virescens with larger sporangia, more rigid 



* Inaug.-Diss. von Munster, i. W. Borna. Leipzig : R. Noske (1908) 51 pp. 

 (2 pis.). See also Hedwigia, Beibl., xlvii. (1908) p. 171. 



t Wiesner Festschrift. Wien : Carl Konegen, 1908, pp, 176-92 (1 pi.). See 

 also Hedwigia, Beibl., xlvii. (1908) p. 171. 



% Journ. Bot., xlvi. (1908) pp. 216-19. 



