Biologie. — Morphologie etc. 67 



begins to develop, it grows rapidly but does not become viscid until 

 very late in its development. Another inseet Visits the flower b}>- 

 the same passage probably carrying some pollen with it which in 

 its turn is brushed off by the ciliated indusium and falls on the 

 viscid surface of the Stigma. M. N. Owen (Kew). 



Allen , C. E., TheSpermatosrenesisof Polytrichum juniperinum . 

 (Ann. of Bot. XXXI. p. 269-291. 2 pl. 1917.) 



This paper forms a sequel to C E. Allen (1912) Cell structure, 

 Growth, and Division in the Antheridia of Polytrichum juniperinum, 

 Will. Arch. f. Zellforsch. Bd 8 p. 121, in which the history of the 

 cell occupying the interior of the antheridium is carried down to 

 the androcyte mother-cells. The development of the antherozoids is 

 described in the present paper, and the history of the androcyte is 

 compared with that recorded for other Bryophyta and Ferns. The 

 more important points in the development of the antherozoid of 

 Polytrichum juniperinum may be summarized as follows: 



Each newly formed androcyte contains a smail rounded blepha- 

 roplast which behaves like a centrosome in the division of the an- 

 drocyte mother-cell. The blepharoplast elongates. places itseif in 

 contact with the plasma membrane, and ultimately forms a long, 

 peripherally placed, curved cord. Two long cilia grow out from it; 

 their point of attachment is a short distance behind the anterior end 

 of the blepharoplast. The nucleus moves into contact with the ble- 

 pharoplast and Stretches out along the latter. The blepharoplast 

 ultimately becomes indistinguishable from the nucleus exceptforits 

 anterior end, which apparently projects a short distance beyond the 

 tip of the elongated nucleus. The nucleus becomes a long, slender, 

 coiled, finally, homogeneous body, of about one and one-half turns. 

 The nucleus and blepharoplast seem to constitute the whole of the 

 body of the mature antherozoid. At about the time the blepharo- 

 plast begins to elongate, a large, spherical body, the limosphere, 

 appears in the cytoplasm. It divides unequally, the larger part per- 

 sisting in the cytoplasm, while the smaller part becomes the apical 

 body, but does not apparently take any part in the formation of the 

 bod} 7 of the antherozoid. During certain stages in the history of the 

 androcyte, another conspicuous cytoplasmic body, the perenosome, 

 seems to be regularly present. Agnes Arber (Cambridge). 



Taresson, G., Om plagiotropi hos strandväxter [Ueber 

 Plasriotropismus bei Uferpflanzen]. (Bot. Notiser. p. 273 — 

 296^1917.) 



Um die physiologische Natur des bei vielen Uferplanzen auf- 

 tretenden Plagiotropismus zu ermitteln, hat Verf. an der ökolo- 

 gischen Station auf Hall and Väderö, Südschweden, Versuche 

 mit folgenden Alriplex-Formen angestellt: A. Babingtonii; A. has- 

 tata; zw T ei konstante Rassen von A. latifolium: eine aufrechte, A. 

 tat. erectum, und eine kriechende, A. tat. prostratum; A. litorale; 

 zwei konstante Rassen von A. Patulum: eine aufrechte, A. pat. 

 erectum, und eine kriechende, A. pat. prostratum; A. prostratum 

 Bouch. (== A. depressa Hn.). Ferner wurden auch Glyceria maritima, 

 Leontodon autumnalis , Plantago coronopus, Roripa palustris, Suaeda 

 maritima, Cotoneaster integerrima und Prunus spinosa untersucht. 



