124 Bacteriologie. — Pteridophyten. — Floristik etc. 



stätigt werden. Nachdem die Bakterienart an das neue Kohlehydrat 

 sich angepasst hat, lässt sich eine gewisse korrelate Aenderung in 

 den Eigenschaften der angepassten Bakterien feststellen; die ange- 

 passten Stämme erzeugen mehr Gas als die nichtangepassten Mutter- 

 stämme. Matouschek (Wien). 



Holden, H. S., Further observations on the wound reac- 

 tions of the petioles of Pteris aqiiilina (Ann. Bot. XXX. N" 

 127. p. 127—134. 4 text fig. 1916.) 



A number of specimens of Pteris aquiUna showing wound- 

 reactions were collected in Cumberland and Nottingham shire. 

 All of them showed certain wel-marked features in common. 



1) Discoloration of the cells abutting on the wound, owing to 

 the deposition of a tannin-like substance. 



2) The partial or complete degeneration in the area of the 

 wound of the lignified elements of the sub-epidermal armour. 



3) A certain thickening of the cell-walls, with or without ligni- 

 fication. 



In certain cases the wounding seemed to have caused elonga- 

 tion through a large part of the cortex. When the wounded area is 

 external to the sclerenchyma the vascular bundles appear to show 

 no traumatic response. Apart from occasional discoloration even 

 deeper wounds seem normally to have no effect on the vascular 

 tissue. Occasionally, but rarely disintegration of the bündle occurs. 

 When the bundles show an obvious traumatic reaction those affected 

 abut on or are adjacent to the surface of the wound. 



One marked characteristic of these traumatic reactions was the 

 general absence of a gum deposit, so constant a feature of artificial 

 traumatic Stimulation. Deposit of gum occurred only in cavity-paren- 

 chyma and occasional tracheides. Isabel Browne (London). 



Addisonia. Colored illustrations and populär descrip- 

 tions of plants. Vol. I. NO 1. (New York, March 31 , 1916.) 



A new serial in royal octavo, to appear quarterly, each part to 

 consist of ten colored plates with accompanying letter-press. Edito- 

 rial and publication details are in the hands of Dr.J. H. ßarnhart 

 and Mr. G. V. Nash. The subscription price is fixed at 110.00 

 per volume. 



The initial number contains plates and text for Rhododendron 

 carolineanum , Caesia polyphylla , Rohinia, Kelseyi, Pachyphytuni lon- 

 gifolium, Begonia CoweÜii, Echeveria setosa, Columnea gloriosa, Jon- 

 quieria forrnosa, Maxiilaria ringens, and Nopalea Auhersi, — the 

 text being signed by the responsible writer in each case. The il- 

 lustrations, drawn by M. E. Eaton, are well reproduced. 



Trelease. 



Brown, N. E., Two little known South African Euphorbias. 

 (Kew Bull. Mise. Inform. W 2. p. 44. 1 plate. 1916.) 



E. pnhiglans N. E. Br., is first dealt with and the differences 

 between this plant and E. clava, Jacq. are pointed out. The second 

 species described is E. enopla, Boiss., — a species described 50 

 years ago, but hitherto very imperfectly known. E. M. Cotton. 



