OLPIDIUM. 



107 



Olpidium brassicae. (Wor. > ] \ =<'/ti/f,-itlini/i brassicae, Wor. > 

 Cabbage-seedlings die if this fungus finds its way into the tissue 

 at the neck of the root. The spherical sporangia an- formed at 

 this place, and their long necks project out of the cells enabling 

 the uniciliate swarm-spores to escape. Resting-spores with a 

 warty thickened membrane occur in the cells of tin- i-j.idt.Tmis. 



KM.. .'4. (.'If' \Vor. Cull ciiit;iiiuiitr thix-e ~i"r,un.'i.i. tw.. . I 



which are discharging /ousi>ivi ; one sporangium i- all ptj Reel 



s inside the cells ( a ral>ii;ii_',.--i>lant. (After Woronin.) 



The disease is favoured by moisture, and restricted by dry 

 surroundings. (Iroiuid subject to attack >lnndd l.r j.lantfd 

 witli crops other than cabbage. 



Olpidium trifolii, St-hroet. ( = X/////7/ ////////// ////;<///, Pass.) 

 1'n n luces deformation of the leaves and j.etiolt-s nf Trifolii/ m 

 repens. The fungus lives in the ejiidermal cells. 



Olpidium lemnae, Kisch., in epidermal cells of Lemna. 



Olpidium simulans. I >- I-arv and Wor., in T !' 



utilri ,1,1], . 



A number of other species inhabit al-ae. -pores, I' 

 mveelium, jiollen-urains, and e^s of Hntntnrm. 



The genera Reesxia, I'* m/n/jili/ii/i/i, u/jii</it'/>xi.-<, 

 K:t,'i><i'll<i, I'l.nl ],;,!; a i, i are j.arasitic oidv on lower plants, 

 on al-ae. 



SYNCHYTRIACEAE. 



The whole niyceliuni divides up into a number of >jH.i-.inL, r ia, 

 whii'h remain to-eihej- as a -i.nis. The winter resting-eporefl 



\\ 



iii, /'/// /'/-/! itii'* 



'l'iK 7i /'."-. Botanik, 



li> .''I 



