360 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the list now includes sixty-one species. Navaa has substituted the generic 

 name Nemaria (nema, filament) for Roccella. He explains that the Lin- 

 nsean name Lichen roceettus was changed by De Candolle to Roccella 

 tinctoria. that by the laws of priority we ought to call the lichen in ques- 

 tion R. roccella. and since such a duplicated combination is contrary to 

 the Vienna rules, it has become necessary to supply the new generic 

 name Nemaria with the family name Xeinariacese. 



Howe, Heber R. — Manual of the genus Usnea, as represented in North and 

 Middle America. 



"The writer recognises eight species in the North American flora : full de- 

 scriptions are given.] 



Biill. Torrey Bot. Club, xxxvii. (1910) pp. 1-13 (7 pis.). 



Jatta, A. — Flora dell' Isola di Pianosa. Lichenes. (Lichens from the Island of 

 Pianosa.) 



[A list of thirty-three species is given, with one new species and one new 

 variety.] Xuovo Giorn. Bot. Ital., xvii. (1910; pp. 150-3. 



)mei>-ep., T. — Lichenes apnd H. von Handel-Mazetti : Botanische Reise in das 

 Pontische Randgebirge. (Lichens collected on H. von Handel-Mazzetti's 

 botanical journey in the Pontische Rand Mountains.) 



[A number of new varieties and forms are included in the list.] 



Ann. Xat. Hist. Hofmuseinn, Wien, xxiii. (1909) pp. 107-23 (2 figs.). 

 See also Bot. Centralbl., cxiii. (1910) pp. 374-5. 



Mycetozoa. 

 (By A. Lorrain Smith.) 



Mycetozoa of Ceylon.* — T. Petch first discusses the gatherings of 

 species made by older botanists and determined mostly by Berkeley and 

 Broome. He then gives a short account of the climatic conditions that 

 prevail in the island and their effects on the growth of the organisms. 

 During the first three months of the year mycetozoa are practically 

 aliseiit. Rain begins to fall in April, and there is a constant growth of 

 species right on to December. Although the majority of Ceylon species 

 are to be found in Europe, the relative abundance varies. Petch notes, 

 as a consequence of the greater rainfall, a tendency to " wander." and 

 the greater height from the ground at which species are found. He has 

 collected species from rotten branches over 50 feet high. The dead leaf 

 bases and the stems of living palms provide many species up to a height 

 of 10 feet. The total number of species now known to occur in Cevlon 

 is 102. 



Jaap, 0. — Myxomycetes exsiccati. Nos. 61-80. 



Hamburg, 1909. See also Bot. Centralbl, cxiii. (1910) p. 282. 



Lister, G. — Two New Mycetozoa. 



^Two species of Physarum, both from Western America ; one of them, P. 

 alpinum, was also collected at Arolla, iu Switzerland.! 



Journ. Bot., xlviii. (1910) p. 73. 

 Meylas, Ch. — Myxomycetes der Jura. 



"The completion of Meylan's list of species from the Jura. There is one 

 new genus, Lampradermopsis.~ 



Bull. Sue. Vaud. Sot. Xat., xlvi. (1910) pp. 49-57. 



* Ann. R. Bot. Card. Peradeniya, iv. No. G (1910) pp. 309-71. 



