Morphologie, Teratologie, Befruchtung, Cj^tologie. 227 



author attributes to the transpiratory and mechanical requirements 

 of a flower scape which has to carry water to an extensive vegeta- 

 tive development and also to sustain it. 



Agnes Arber (Cambridge). 



Fraine, E. de, The Morphology and Anatomy ofthe genus 

 Statice as represented at Blakeney Point. F a.ri \. Statice 

 binervosa, G. E. Smith, and S. hellidifolia DC. (= S. reticulata). 

 (Ann. Bot. XXX. p. 239-282. 1 pl. 28 text figs. 4 tables. 1916.) 

 [With systematic and ecological notes by Salisbury E. J.] 



The Blakeny Point area in Norfolk possesses every British 

 species of the genus Statice with the exception of 5. Dodartii (Gri.). 

 The present paper is concerned with the forms Avhich are more 

 specially related to the shingle banks and lows namely 5. binervosa, 

 G. E. Smith and S. bellidiflora DC, while the species more parti- 

 cularly characteristic of the salt marsh will be dealt with in a later 

 communication. 



Three main forms of 5. binervosa are distinguished: («) the tall 

 form (6) the dwarf form (c) the ? hybrid form between 5. binervosa 

 and 5. bellidifolia. The habitats of all the forms are described, and 

 the ecological factors involved and their possible effects on the 

 plants are considered. Experimental evidence is brought forward 

 to show temporaril}'- stimulating effect of shingle on growth — the 

 effect is due to mulch action. 



The structure, number and distribution of the two kinds oi 

 glands characteristic of the order are described. The muciiage glands 

 function in preventing desiccation of the apex; the mettenian glands 

 excrete water, but probably only function when the amount absorbed 

 by the roots is greater than the rate of transpiration. The seedling 

 of S. binervosa is described and it is shown that the method of 

 transition from root to stem follows van Tieghem's Type 3. 



The structure of the roots in all the forms is described. In 5. 

 binervosa the structure is in every way adapted to withstand the 

 pressure of shingle and is admirably suited, both internally and 

 externally, to life in an habitat characterized by scarcity of water. 

 The root of S. bellidifolia, on the other hand, resembles that of 

 many salt marsh plants, and shows none of the characters of sta- 

 bilized shingle plants. 



The structure of the leaf is bifacial in S. bellidifolia and in the 

 hybrid 5. binervosa, but is isobilateral in all t-he other forms. Diffe- 

 rences occur in the abundance of the sclereides present. The effect 

 of the various habitats on their production is examined, and the 

 influence of culture under favourable conditions in diminishing 

 mechanical tissue (as in the root and stem also) is pointed out. 

 The effect of culture on the development of the intercellular space 

 System and on the production of cuticle, indicates a definite reac- 

 tion of the plant to the external conditions. 



The anatomy of the inflorescence axis and the floral morpho- 

 logy of 5. binervosa, the ? hybrid form and 5". bellidifolia are fuUy 

 described. Agnes Arber (Cambridge). 



Hamilton, A. A., The instability of le af-morphology in 

 its relation to taxonomic botany. (Proc. Linn. Soc. New 

 . South Wales. XLI. 161. p. 152-179. 1916.) 



After a preliminary review of the various factors affecting leaf 



