Allgemeines 83 



5. The author has not made any cytological research of 

 the development of the ovule; but basing his opinion on a 

 paper by T. Schwere (Flora, Vol. LXXXII, 18%) he takes 

 it ior granted that the dandelion has true partheno- 

 genesis, as Schwere's figures show that the eggcell deve- 

 lops into the embryo. The statement of Schwere that he has 

 Seen a pollen-tube is probably a mistake; Mr. Raunkiaer 

 has often searched for germinating pollen-grains on the stigmas, 

 but in vain. 



6. Some preliminary experiments with allied genera of 

 Cichorieae seem to result in the fact that parthenogenesis is 

 confined to the Dandelion, but this matter requires further 

 examination. 



7. The paper finishes with the following „Conspectus specierum 

 Taraxaci in Dania hactenus observatarum" : 



A. Squamis involucri exterioribus lineari-lanceolatis divaricatis vel 

 reflexis. 



a. Antheris polline repletis (sed germinatio granulorum poUinis 

 nunquam observata). 



1. Squamis involucri exterioribus reflexis; species praecipue 

 agrorum graminosorum. T. vulgare (Lam.). 



2. Squamis involucri exterioribus divaricatis vel recurvis ; 

 Species pratorum satis humidorum. 



T. intermedinin Raunk. 



b. Antheris sine polline; squamis exterioribus reflexis. 



1. Calathiis minoribus quam in T. vulgare; corollis flavis_, 

 exterioribus denique 12 — 16 mm. longis. 



T. Ostenfeldii Raunk. 



2. Calathiis magnitudine eorum T. vulgaris vel majoribus ; 

 corollis aurantiaco-flavis exterioribus denique 18—23 mm. 

 longis. T. speciosum Raunk. 



B. Squamis involucri exterioribus patentibus, erecto-patentibus vel 

 adpressis. 



a. Antheris polline repletis (sed germinatio granulorum polünis 

 nunquam observata) ; squamis involucri exterioribus pa- 

 tentibus. 



1. Involucri squamis exterioribus ovato-lanceolatis, interio- 

 ribus 8 — 21, acheneis griseis; species silvarum. 



T. Geler tu Raunk. 



2. Involucri squamis exterioribus ovatis, interioribus 13 

 (12 — 14); acheniis rufis. T. erythrospermum Andrzej. 



b. Antheris sine polline. 



1. Squamis involucri exterioribus ovatis, patentibus vel apice 

 recurvis; foliis pinnatisectis. T. decipiens Raunk. 



2. Squamis involucri exterioribus ovatis vel late ovatis, ad- 

 pressis. T. paludosum (Scop.). 



Species danice Taraxaci castratione agamice propagari 

 demonstratum est; species omnes Taraxaci semper partheno- 

 genetice propagari verisimile est. C. H. Ostenfeld. 



RONCA, Raffaele, Alcune idee nuove sulle Narcissee. 

 Napoli 1902. p. 22. Con 22 fig. 



L'auteur se propose de rechercher les regles les plus 

 rationnelles ä suivre pour une Classification definitive des Nar- 

 cisse'es italiennes. Avant tout il demontre que l'origine de la 



6 



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