o cystidáeh Hymenomycetů- 45 



with zoochory. Therefore in these fun.oji the cystidia are 

 closer together on the periphery than in the middle. 



Cystidia nevěr act as hydathodes; this function is 

 performed by the »poils hyméniaux«, which can grow 

 out from any pláce on the cap and stem. The author ascer- 

 tained experimentally that a high temperature and abundant 

 moisture in the atmosphere are conducive to the rise of these 

 trichome-hydathodes ; therefore in the heads of f iingi growing 

 in darkness they are abnormally developed. 



Besides excretion, however, cystidia perform other fiinc- 

 tions, accordingto their structure; in fungi with a very delicate 

 pileus they prevent the touching each other of the lamellae, 

 and insure space for the unhindered development of spores 

 (Coprinus); in fungi with resupinate cap and uncovered 

 hymenia (Thelephoraceae, Polyporeae), the cysti- 

 dia with thickened walls háve a mechanically protective func- 

 tion; dendrophyse are normál hyphae branched, and to 

 them is to be ascribed a filling-out function ; asterostro- 

 m e-hyphae are of analogical import as sclereo- and stereo- 

 idioblasts generally. 



Pragne, Mav 1918. 



