Bacteriologie. — Lichenes. — Pteridophyten. 215 



ones the stem and leaf apex and later on the root. The young plant 

 possesses no truly cauline bündle its vascular System being made 

 up ot coalescent leaf traces. Isabel Browne. 



Lipman, C. B., On the lack of antagonism between calcium 

 versus magnesium and also between calcium versus so- 

 dium. (Bot. Gaz. IL. p. 41-50. fig. 1—2. jan. 1910.) 



An account of experiments showing that there is in respect to 

 theammonification hy Bacillus stibtilis no antagonism between calcium 

 and magnesium. Any combination of the two salts is more toxic 

 than Mg CU alone. There likewise exists no antagonism between 

 sodium and' calcium, any combination of the two salts rendering it 

 more poisonous than Na Cl alone. In these two respects the behavior 

 of B. subtilis tinds no parallel among plants, and scarcely any 

 among animals, so far studied. Moore. 



Loew, O., The biological antagonism between calcium and 

 magnesium. (Bot. Gaz. IL. p. 304. April 1910.) 



Referring to the article by Chas. B. Lipman in the ßotanical 

 Gazette (IL. p 41 — 50. 1910) the fact is pointed out that it is natural 

 there should be no antogonism between calcium and magnesium, 

 as concerns B. subtilis, since microbes with rare exceptions, do not 

 require lime and the antagonism is not between the elements them- 

 selves, but merely between their functions. Moore. 



Malme, G. O. , Stockholmstraktens bruna Parmeliaarter. 

 [Conspectus specierum dement, varietatumque Par- 

 meliae olivaceae (coli.) in viciniis urbis Stockholm occu- 

 rentium]. (Svensk bot. Tidskr. IV. p. 123—125. Stockholm 8/7. 

 1910.) 



A latin description in key-form of the 8 species and 3 varieties 

 of brown Parmelia, found in the neighbourhood of Stockholm. 



J. Lind (Copenhagen). 



Benson , M. , Botrychiiim liinaria with two fertile lobes. (New 

 Phytologist. VII. 9, 10. p. 354. 1909.) 



Miss Benson records a specimen of Botrychium lunaria with 

 two fertile lobes and points out that this condition is simular to 

 that normally obtaining in Ophioglossum pahnatum. 



Isabel Browne. 



Eames, A. J., On the Occurrence ofCentripetalXylem 

 in Equisetum. (Ann. Bot. XXIII. 92. p. 587—612. PL 45. Oct. 1909.) 



The author asserts that in Equisetum the lateral groups of 

 xylem, as well as the central one, contribute to the formation of 

 the trace; that the lateral groups of xylem, though slightly irregulär 

 in development, are centrifugal wood; and that these three groups 

 of xylem together constitute a Single bündle. In these three points 

 he disagrees with Mr. Gwynne Vaughan. But though denying the 

 presence of centripetal xj^lem in the sterile stem Mr. Eames finds 

 a little centripetal xylem in the axis of the cones of certain species 



