6 Pflanzenkrankheiten. — Floristik etc. 



garischen Ebene, wo es ausgedehnte Sandflächen und viele Wasser- 

 becken gibt. Dagegen tritt die Krankheit auf kalten Böden trotz 

 reichlicher Wassermenge und günstiger Witterung, sogar in südli- 

 chen Gegenden, erst spät auf. Nach einem April mit regelmässiger 

 Temperatur und ohne Reif ist das erste Erscheinen der Peronospora 

 vom Mitte Mai und im allgemeinen dann zu erwarten, wenn vom 

 1. April ab der „Bios"- Wert die Zahl 281 erreicht hat. 



Matouschek (Wien). 



m 



Hayata, B., Icones Plantarum Formosanarum nee non et 

 Contributiones ad Floram Formosanam or, Icones of 

 Plants ofFormosa, and Materials for a Flora ofthe 

 Island, based on a Study ofthe CoUections ofthe Bo- 

 tanical Survey ofthe Government ofFormosa. Vol. IV. 

 (P. 1—264. PI. 1—25. 180 Textfig. 1914.) 



This volume contains a small number of species belonging 

 to different families, but especially Orchideae and Filices. In the 

 introduction some Information is given by the author on his wor- 

 king methods. In many cases he could not get the material he 

 wanted for comparison and therefore after having compared his 

 specimens with literature and figures as carefully as possible, he 

 was obliged, if a satisfactory Identification seemed not to be pos- 

 sible, to describe his plants as a new one. For this reason it may 

 be that some of his new species prove to be identical with older 

 ones or merely varieties of known species. At all events, every 

 botanist can agree with the opinion of the author, that his work is 

 an important contribution to the flora of the Eastern countries. The 

 number of new species and varieties is considerable. All are ac- 

 companied by extensive descriptions and most of them are illustrated. 

 Most of the older species mentioned in this paper are accompanied 

 by notes, given as observations based on the writer's material. 

 Although the author calls them observations, most of them can be 

 considered almost as new descriptions, in many cases better than 

 those already existing. When the author identifles specimens with 

 a known species, he always mentions the material he used for 

 comparison. By doing so, he has given to the other botanists the 

 most perfect occasion to controlize his work. 



The species, mentioned without authority in the following list, 

 are new species or such species named formerly by the author and 

 to the descriptions of which he now gives additional remarks. 

 Further the list contains those older species, on which the author 

 has given observations. The species, which are mentioned in this 

 work without description, figure or Observation do not occur in 

 this list. 



Ranunculaceae: Aconitum Fukutornei , to some extent compa- 

 rable with A. sachalinense F. Schmidt. 



Simarubaceae: Ailanthus glandiiJosa Desf. var. Tanakai. 



Rhantneae: Rhaninus actiminatifolia, additions to the description 

 in Vol. III. 



Leguminosae: Acncia confusa Merrill var. Inamurai. 



Rosaceae: Rubins glandulosopimctatiis , near R. rosaefolius var. 

 Maximowicsii Focke. 



Hamamelideae: Corylopsis stenopetaln, near C. Veitchiana Bean. 



Passißoreae: Modecca formosana (Fig. 1, 2; Adenia formosana 

 Hayata olim). 



