82 Morphologie, Teratologie, Befruchtung, Cytologie. 



Cambage, R. H., Acacia Seedlings. II. (Proc. Roy. Soc. New 

 South Wales. L. 1. p. 143—164. 1916.) 



In a previous paper (Part I) the author describes four species. 

 which alone, out of sixty different species raised, have an opposite 

 pair of simply-pinnate leaves appearing next after the cotyledons 

 instead of the more usual one simply-pinnate leaf. The examination 

 of fifteen more species has revealed two further species having an 

 opposite pair of simply-pinnate leaves. These are A. galioides, 

 Benth., a tropical Australian species, and A. Murrayana which 

 occurs in N. S. Wales, Queensland and S. Australia. Further 

 species having only one-pinnate leaf are the following: 



A. pumila, Maiden & Baker, A. trinervata, Sieb., A colletioides, 

 A. Cunn., A. oxycedrus Sieb., A. aspera, Lindl., A. flexifolia, A. 

 Cunn., A. Mabellae, Maiden, A. Hoctoniae, Maiden, A. homalophylla, 

 A. Cunn. (with an exception), A. excelsa, Benth., A. ßavescens, A. 

 doratoxylon, A. Cunn., A. cincinnata, F. v. M. 



A. homalophylla produced, out of four seedlings, three with 

 one simply-pinnate leaf and a fourth which had an opposite pair. 



A. aneura among those previously examined gave a similar 

 result. This must be regarded as a transition stage, other examples 

 will probabl}'- occur. 



Another instance of the wunderfull vitality of the seed, due to 

 its being encased in a strong testa, is again recorded. The seed of 

 A. Parnesiana for the same locality as before was kept for 405 days 

 in salt water. It was however successfully induced to germinate, 

 the testa having been softened and germination hurrid by placing 

 it a number of times in boiling water with intervals of several 

 weeks in the soil. The experiment was to demonstrate the possi- 

 bility of it retaining the power of germination for a sufficient length 

 of time to be driften by oceanic current on a piece of wood for 

 thousands of miles. 



The paper concluded with a detailed description of the follo- 

 wing species: A. triptera, Benth.. A. hispidula, Willd.. A. stricta^ 

 Willd., A. falcata, Willd., A. penninervia, Sieb., A. Mabellae, Maiden, 

 A. pravissima, F. v. M., A. myrtifolia, Willd.. A. binervata, D.C., A. 

 Maideni, F. v. M., A. pubescens, R. Br. M. N. Owen (Kew). 



Davey, A. J. and M. Gibson. On the Distribution of Mo- 

 noecious Plants, and the Occurrence of Hermaphro- 

 dite Flowers in Myrica Gale, with Observations on V a - 

 riations of Sex. (Proc. Linn. Soc. Lond. p. 6—7. 1916—1917.) 



Myrica. Gale, the Common Bog Myrtle, is described as being 

 typically dioecious, but mention has been made by several authors 

 of the occasional occurrence of the monoecious condition. The 

 authors, by means of observations carried on in the peat moors of 

 Somerset over several years, have found that in this locality 

 there is always a small proportion of monoecious plants. which pre- 

 sent all gradations between the normal pistillate and staminate 

 types. These gradations are described. Further it has been found 

 that among plants or shoots marked and examined in successive 

 years, some showed progressive Charge from pistillate to staminate,, 

 while several other cases showed indicaticns of a reverse change. 



Agnes Arber (Cambridge). 



