Referate. 



363 



Spelzenschluß des letzten Typus von demjenigen des gewöhnlichen 

 Weizens genetisch unterscheidet. 



5. Die Merkmalspaare Behaarung-Kahlheit, Begrannung-Grannenlosig- 

 keit, loser-lester Spelzenschluß mendeln unabhängig voneinander. 



6. Der Square-head-Typus ist gegen lockerere Ährentypen rezessiv. 



7. Es gibt einen rompur/um-UhnMchen Ährentypus, der sich gegen 

 lockerere Typen rezessiv verhält, während das eigentliche compacttim 

 über lockerere Ährentypen dominiert. 



8. Für die Bereifung der Weizenähren sind mindestens zwei Gene 

 anzunehmen. 



Referent möchte mit Rücksicht auf seine eigenen Erfahrungen nicht 

 allen diesen Schlußfolgerungen ohne jeden Vorbehalt zustimmen, sondern 

 hat Grund zu der Überzeugung, die durch vorliegende verdienstliche Arbeit 

 eher gestützt als beseitigt wird (vgl. die vielen Ausnahmen von den theoretisch 

 geforderten Zahlen Verhältnissen der Spaltungen), daß die Genetik des Weizens 

 schwieriger aufzuklären ist, als nach den seitherigen Untersuchungen an- 

 zunehmen wäre. L. Kießling. 



Hamshaw, Thomas H. "The fossil Flora of the Cleveland District of 

 Yorkshire: The flora of the Marske Quarry." Quart. Journ. Geol. Soc. 

 1913. 69, pp. 223—251, pis. XXIIi— XXVI. 

 The coast of Yorkshire is classic ground for the palaeobotanist, and 

 the numbers of good specimens found there have long attracted attention: 

 some of the species were even described by Brongniait. Prof. Se\V.\rd's 

 Museum Catalogue of the Yorkshire Jurassic flora (publ. 1900) crystallised 

 the work on these rich deposits up to that date. Since then much 

 detailed collecting has been done, and thanks, principally to the work of 

 Mr H. H. Thomas, more detailed accounts of the distribution of the plants 

 in the different beds, is being rendered available. The "Ecology" of fossil 

 plants awaits the worker, and the Jurassic beds seem favourable ground. 

 In the present paper a number of plants are described from Marske Quarry 

 in Yorkshire, a spot near to, but not identical with the usually- worked 

 localities. Marattlopsis aiiglica sp. nov. and Pstitdoctenis land sp. nov. are 

 described for the first time. In the geographical distribution of the plants 

 it is noted that these two species as well as ßiiiera longifolia (Brongn.) and 

 Dictyozainites hawelli Sew. are not found in the other localities in England. 



M. C. Stopes. 



Seward, A. C. "A Contribution to our Knowledge of Wealden floras, with 



especial reference to a Collection of Plants from Sussex." Quart. Journ. 



Geol. Soc. 1913. 69, pp. 85 — 116 and pis. XI — XIV. 



The rich deposits of Wealden plants described by Prof. SEWARD in 



the British Museum Catalogue and elsewhere, have helped to render this 



flora one of the better known of fossil floras. Seward's "Catalogue" of 



Wealden Plants was published in 1894 however, and since then a number 



of further facts have come to light. The present paper both brings the 



whole subject more up to date and also describes several new specimens 



from Sussex which have been recently obtained by W. Dawson and Fathers 



Teilhard de Chardin and Felix Pelletier. The following are the 



species described for the first time, or of which older descriptions are 



