ÜKKANIUM BOHEMICUM X G. HOHEMICUM *DEPREHENSUM 249 



Haiipturt oder die vom dcprclicnsuin-'Vypus. die sich in der liastardc; 

 nicht normal entwickeln können? Ich bin geneigt die der Ilauptlorm 

 anzunehmen. Hei den hybriden Keimlingen id)er\viegen nfunlich die 

 weissen Partieen in der Hegel IkhIisI belrächlhch (siehe z. H. Fig. 7!); 

 die grünen fasse ich auf als von f/r/>rr/»c/j.sf///i-(^hromalophoren ver- 

 ursacht, welche durch den Pollenschlauch wohl verhältnismässig spar- 

 sam eingeführt sind. Wie gesagt habe ich leider noch keine Pflanzen 

 der Verbindung Geranium bohcmicuni *deprehensiim X bohemicum er- 

 halten. Wenn meine Annahme zutreffend ist. müssen diese natürlich 

 schwächer panachiert als die bisher erhaltenen Pflanzt>n sein. Ich 

 hoffe meine Untersuchungen s])äter Nollführen zu können. 



Uppsala. Botanisches Institut d. Unixcrsität, November 1922. 



SUMMARY. 



Geranium bohemicum L. ^deprchensum Eiuk Akmq., lound in 

 southern Sweden, differs from the main species by ((instant charac- 

 teristics regarding the colour and the size of the seeds (fig. 1), the 

 shape of the cotyledons (cp. figs. 2 and 3) and the leaves, the size 

 of the petals and the colour of the stigma. 



Geranium bohemicum is known to appear suddenly after burns or 

 in places where debris has been set on fire, (ienerally the seeds do not 

 germinate withont heat. They keep their power of germination very 

 long, at least for a i)eriod of 60 years. Upon disj)ersal the seeds 

 probably rest in the ground until a new fire stimulates to germination. 

 The cross G. bohemicum X *deprehensum, which has been made 

 two times, resulted in green-white marbled seedlings (figs. 4 — 7) in 

 spite of the fact that the parents are pure green. Most of the seed- 

 lings are starved to death l)ecause of lack of chloroi)byll. The po- 

 sition of the plumule within a white or green tissue section deter- 

 mines the further development of the seedlings. Two flowering Fi- 

 individuals have been obtained (fig. 8). They showed vegetative 

 segregation» of their shoots in pure green, pure white, sectionally 

 coloured or spotted. The flowers resemble those of the deprehen- 

 sum type (fig. 9) but have rudimentary stamens (cp. the female 

 flowers in G. silvaticum, fig. 10 c). Seeds do not develop upon back 

 crossing with the parent type although sometimes young embryos are 

 found in the embryo sacs. 



The similarity between these Ger(niium crosses and B.\lr's well 

 known experiments with Pelargonium zonale aîbomarginatum is 



