CURRENT LITERATURE 189 



ENCALYPTA CILIATA, VAR. SUB-CILIATA, WARNST. By H. N. 

 Dixon (Journ. Bot. 1909, p. 109), gathered by G. Stabler in 

 Aberdeenshire " in the eighties." 



HlERACIUM SILVATICUM, GOUAN, VAR. TRICOLOR, W. R. LlNTON, 



IN BANFFSHIRE. By Ed. S. Marshall (Journ. Bot. 1909, p. no), 

 from limestone rocks near Tomintoul. 



OBITUARY OF SIR GEORGE KING, F.R.S., with portrait (Journ. 

 Bot. 1909, pp. 120-122). 



OBITUARY OF ALEXANDER WHYTE, F.L.S. (Journ. Bot. 1909, 

 P- i55)- 



EUPHRASIA MINIMA. By W. P. Hiern (Journ. Bot. 1909, pp. 

 165-172), found in England on Exmoor as a yellow-flowered plant. 

 The relations between E. minima, E. scottica, and E. foulaensis are 

 not discussed. 



NOTES ON THE TRAP-FLORA OF RENFREWSHIRE. By G. F. 

 Scott-Elliott (Ann. of Andersonian Nat. Soc. iii. Glasgow, 1907). 

 The trap is porphyritic of O.R.S. age. Sequence of vegetation 

 is : (i) Lichen stage, crustaceous (Lecidea, Lecanora, etc.), and 

 foliaceous (Parmelia, Cladonia, etc.). (2) Moss stage, Rhacomitrium, 

 etc., and lichens, in tufts, forming a soil and protecting the rock. (3) 

 Vaccinium stage, , the soil is tenanted by Vaccinium, Calluna, heath 

 grasses, etc., living in crannies or in the humus. In wet situations 

 sphagnum accumulates, and Eriophorum, Scirpus ccespitosus, etc., 

 occupy the surface. In dry situations (3) is followed by (4) Herbaceous 

 stage, on disintegrating rock with rapid drainage, with Scabiosa, 

 Thy mu s, Campanula rotundifolia, Teiicrium, Viola, etc. (5) Ulex 

 stage, Ulex, Cytisus, Pteris, etc., dominant. (6) Rosaceous stage, 

 shrubby and arboreal Rosacese replace Ulex, etc. This stage is 

 followed by trees of oak, etc. 



LE PLANCTON DES LACS ECOSSAIS. By H. Bachmann (Arch, 

 des sc. phys. et nat. Geneve, xx. 1906, pp. 359-361). Relates to 

 nine lochs, of which (except Loch Leven) the plankton was 

 examined living. Always present were Cryptomonas, Mallomonas, 

 and Chlamydomonas, all very frequent in the Swiss lakes also. The 

 organisms dominant in the Scotch lochs were : Leven, Asterionella 

 gracillima ; Earn, Clathrocystis, sp. ; Lochy, Tabellaria fenestrata, 

 var. asterionelloides ; Oich, Ceratium hirundinella ; Ness, Asterionella 

 gracillima; \^'2a\z%^!\,Uroglenavolvox\ Morar, Staurastrum ; Lomond, 

 Clathrocystis, sp. The lochs that communicate with one another 

 retain their characteristics, as do the Swiss. The author notes the 

 numerous Epiphytes in the plankton and the constant presence of 

 two species of Bacteria on the colonies of Clathrocystis. 



