SEXUAL REPRODUCTION. 181 
perhaps they might be thought to perform the part of andro- 
spores, attributing to that expression the meaning which 
Pringsheim gives it in the Conferoge. The experiments per- 
formed with the spermatia which do not germinate, and with 
the spermogonia of the Uredines, do not, at any rate, appear 
to justify the reputed masculine or fecundative nature of these 
organs. The spermogonia constantly accompany or precede 
fruits of Aicidium, whence naturally follows the presumption 
that the first are in a sexual relation to the second. Srill, 
when Tulasne cultivated Exdophyllum sempervicum, he obtained 
on some perfectly isolated rosettes of Sempervirum some .Licidium 
richly provided with normal and fertile spores, without any trace 
of spermogonia or of spermatia. 
