EU-MYCETES.— (/.) BASIDIOMYCETES 



445 



the urcdo-sporcs and teloiito-sporcs arc on leaves of species of Carex, 

 and the accidium-stagc on the common Nettle, cuisine rontortf<| 

 swellings upon its stem and leaves. Thus the K\ist (.f WIkmI is aii 



example of a life-history that is not uncommon. 



I'iG. 3;.j. 

 Longitudinal section of a leaf of Wheat, showing a germ-tube of a Ur«do\fore 

 passing through a stoma (a) into the intercellular space (b\. Very highly magnified. 

 (After Marshall Ward.) 



Sections through a diseased leaf of wheat in summer reveal the 

 branched and septate hyphae closely packed in the intcr-cellular 

 spaces, and investing the green cells. They accumulate below the 

 epidermis, forming a spore-bed, their endings swelling into the uredo- 



l-ic. 3''o- 

 Longitudinal section through a patch of the IVUnt.' sp.n s ,.i / n.. .<>... . : . , ... 

 of Wheat-straw. Highly m.ignifted. (.^ftcr .Marshall \\.ml.) 



Spores, which, increasing in bulk and number, burst the epidrrrv,-. . 

 and are shed (Fig. 377)- E^ch spore is covered by a thick w.vll. 

 containing dense protoplasm with oilv globules, and hro mulei. Their 

 walls are marked bv thin spots round tlic equator. If is from these 



