360 Fortpflanzung. 



ristischen Eigentümlichkeiten des Accomodationsmechanismus bei den Fischen, 

 Amphibien, Sauropsiden, Säugern und Cephalopoden in übersichtlicher Weise zu- 

 sammengefaßt. 



Das Werk ist gleich willkommen und anregend für den, der auf diesem Ge- 

 biet selbst wissenschaftlich arbeitet, wie für den, der sich über irgendeine Frage 

 schnell und gut zu orientieren wünscht. R. Dem oll (Giessen). 



Hierzu: Nr. 1132, 1133, 1173, 1182, 1183, 11<)2, 1196, 1202, 1207, 1208, 1215. 



Fortpflanzimg. 



1147) Berridge, Einily M., The structure of the female strobilus in Gne- 

 tum Gnemon. In: Annais of Botany, Voh 26, Heft 4, S. 987—992, figs. 4, 

 1912. 



Reasons are presented for believing that in the genus Gnehmi (Gnetales) the 

 inflorescences were originally Compound and bisexual, from which both male and 

 female spikes have been derived. In some of the Indo-Malayan species the male 

 Spikes have retained their bisexual character, but in the female spikes, a ring 

 of com.plex groups of vascular Strands arising from the bundles in the base of 

 the female "flower" in Gnefum gnemon is held to represent the only remnant 

 of this condition in the genus. Gates (London). 



1148) Coburu, Hilda (Liverpool, University), The fruiting of CatencUa 

 opuntia. In: Annais of Botany, Bd. 27, Heft 1, S. 167, 1913. 



This member of the Red Algae is rarely found with fruiting organs, their 

 occurrence having only been recorded a few times. This note records finding them 

 on the Cheshire coast. Gates (London). 



1140) Thoday (Sykes«), Mary G. and Berridge, Emily M., The anatomy and mor- 

 phology of the inflorescences and flowers of Ep hedra. In : Annais of Botany. 

 Vol. 26, Heft 4, S. 953—985, pl. 85, figs. 21, 1912. 



In this geuus of Gnetales a number of species are compared in the anatomical 

 structure and morphological development of the inflorescences. A very variable condition 

 as regards the ovules, was found in Epliedra altissima, some flowers being biovulate, 

 some uniovulate with an abortive nucellus and some intermediate; which shows that the 

 Single terminal ovule in the female flowers of most species has been derived from a bio- 

 vulate condition. 



The outer and inner coverings of the female flower are regarded respectively as 

 the outer and inner integuments The micropyle becomes closed with a plug of mucilage 

 after fertilizatiou, and the epidermal cells of the outer iutegument grow out and close 

 the Space between it and the inner integument. This is physiologically an abortive at- 

 tempt at Angiospcrniy. 



Great Variation in the number of male sporangia occurs in the different species of 

 Ephedia, forming a reduction series. Throughout the paper rea^^ons are given for regar- 

 ding the Gnetales as related to the fossil Bennettitales, from which they may have been 

 derived by the abortion and telescoping of various parts of the inflorescences. 



Gates (London). 



1150) Dümmer, 11. A. (Kew), A bisexual "gymnospermous" Bcgonia. 

 In: Annais of Botany, Vol. 26, Heft 4, S. 1123—1124, figs. 3, 1912. 



This unique teratological malformation occurred in Bef/onia scmperflorcns var. 

 gif/antefi, a garden hybrid, among a batch of normal plants at the Royal Botanic 

 Gardens, Kew. The ovules were wholly exposed owing to the absence of the 

 ovary-wall. and the flower differed from normal in several other respects. 



Gates (London). 



