54 ON THE ruNai or the ' challe:noee ' expedition. 



Mr. Broome (P. luteo-olivaceus^ B. & Br.), which at first sight 

 looks very like this ; but instead of being flexible it is hard and 

 coriaceous, while the pores, which are smaller, are deep umber and 

 punctiform. 



C P. (Placodeemei) Fullagert, B. Durissimus ; pileo pul- 

 vinato, postice nigrescenti-brunneo, antice subtiliter velutino rha- 

 barbarino rugoso parce sulcato ; vertice elongato ; contextu fulvo ; 

 poris minutissimis. 



Pileus 3] inches wide, 1| long, 1| high, with elongated vertex ; 



pores yJ-^ inch in diameter. Very hard, cracked behind with two 

 or three concentric grooves, 



T}. Hexaoona eigiba, B. Dimidiata, postice decurrens, rigida ; 

 pileo umbrino concentrice zonato- sulcato radiato ruguloso gla- 

 brescente ; margine sulcisque elevatis subtiliter tomentosis ; hy- 

 menio pallido ; poris magnis. 



Pileus 3 inches wide, or 6 by confluence, 2 long ; pores iVn^ 

 in diameter. When fully developed quite smooth, cream-coloured 

 within. There is a variety with slightly narrower pores andlobed 

 margin ; also a bleached state just intermediate. 



DESCEIPTION OF PLATE II. 



Fig. 1. Sketch of a spray of Thyja dolahrata, with the TJromi/ces defor77ians, 



B. & Br., in situ. Drawn from a specimen In the Kew Herbarium, aud 

 of the natural dimensions. 



2. Branchlets from which the Uromyces has fallen, but enlarged. 



3. One with the peridium perfect ; still more enlarged. 



4. Branclxlets with and without fungus ; very considerably magnified. 



5. A view of the spores in situ ; also highly magnified. ' 



6. Two separated spores, still further enlarged. Spores -0015, '002 inch 



long. 



7. Vuccinia corticioides, B. & Br., the plant ; of natural size. 



8. Spores of the same, greatly magnified. The heads of spores '0008 to 



OOl inch long, globose when young ; stalks -007 to 'OOS inch long. 



-] 



