034 SUMMARY OF CURRENT RESEARCHES RELATING TO 



the lichen-flora, as so many changes are made in the different locali- 

 ties by the advance of agriculture, or, in the case of limestone 

 rocks, by quarrying the material on which so many rare species have 

 been found. He notes particularly the presence of two crustaceous 

 forms — Rinodina oreina f. Mougeoteoides and Acarospora chlorophana — 

 on Lydite rocks. He found these constantly on the Lydite, and usually 

 in great abundance ; and this was the more remarkable as these rocks are 

 usually very barren. He further states that the species are not affected 

 by position or by orientation ; they grow equally well in sun or shade, in 

 exposed or sheltered situations. The substratum alone seems to be the 

 factor of importance in their growth. The locality and substratum are 

 given with each species. 



Ceozals, A. de — Lichens observes dans l'Herault. 1. Lichens d'Agde et de 

 Roquehaute. (Lichens observed in l'Herault.) 



[A list of 27 species of Collematacese, 292 lichens, and 22 parasites. The 

 soil is of volcanic origin.] 



Bull. Acad. Internal. Gdogr. Bot., sir. 3, xvii. (1908) pp. 498 -556. 

 See also Centralbl. Bakt., xxvii. (1910) p. 278. 



Wheldon, J. A. & Albert Wilson — Inverness and Banff Cryptogams : 

 Lichens. 



[A list of specimens found on the Northern Grampians.] 



Journ. Bot, xlviii. (1910) pp. 127-29. 



Mycetozoa. 



(By A. Loeeain Smith.) 



Mycetozoa of the Midland Plateau.* — W. B. Grove has found in 

 the country round Birmingham seventy-seven species of Mycetozoa. The 

 localities are in the counties of "Warwick, Worcester, and Stafford, and 

 he states that about one-fourth of all the known species have been re- 

 corded from these districts. The author gives a short sketch of the 

 group and of their habitat, and notes the manner in which the Plas- 

 modium travels to some exposed position for the formation of sporangia. 

 The list includes the locality and the names of the collectors. 



Plasmodiophoraceae.t — Rene Maire and Adrien Tison publish an 

 account of Tetramyxa, a little known genus of Plasmodiophoracere. 

 There are only two species, T. Triglochinis and T. parasitica. The latter 

 grows on Ruppia and Zannichellia, and is the one that has been examined. 

 It forms tumours on the host-plant, the swelled tissue being due to the 

 active division of the cells irritated by the parasite. In each infected 

 cell there is but one " schizonte," though occasionally several are fused to 

 form a plasmodium. Whilst in this condition the nuclei divide in the 

 manner described in Plasmodiophora and Sorosphsera. A spore-forming 

 stage follows ; the energids forming the plasmodia separate, and the 

 nucleus of each one undergoes two divisions, resulting in four daughter- 

 cells, which become four spores. 



* The Fauna of the Midland Plateau. Birm. : Nat. Hist. Soc. (reprint), 1910,. 

 23 pp. f Comptes Rendus, cl. (1910) pp. 1768-70. 



