Scleroderris fuliginosa (Fries), i I'.ritain and I'.S. Aim-ru -a.i 

 This was eon.-idered to le a saprophyte till my attention was 

 directed to its injurious nature. It occurs on livin- branches 

 df Salix Caprea, /S. triandra, N. "//', etc., and brings ah.>m 

 their death. The Mack crusts, on which the apnthecia develop. 

 appear both mi weakly twi^s and stron- branch.-. The my- 

 celium makes its way throu-h tlie ti.-sues tn tin- camliiiiin, which 

 it kills, caii-ini: this and neighbouring parts to become In own. 

 Adjacent parts, as yet unat tacked, continue at first { -row in 

 thickness, but they too are gradually killed. As a result, the 

 twi-- attacked ^row irregularly accnrdin- to the extent and 

 number of diseased places (Fig. 1.".4): and when all or most 

 of the lower tissues of a twii; are killed, the higher part< 

 die off with their lea\e<. \Vhcrc\-cr the fungus appears, many 

 trees are generally attacked. 



Sc. aggregata (La-di.) il.-v.-|.|is on tin- livinu" >tnns of l!liiiiiiiitlia-.-;t.- 

 and iiiaturc- mi tin- dead. 



Sc. ribesia (Pere.) is a common -~| <{,-* ,,\[ t \\ i'j> <>\ r-d and Mark run ant. 



lnit \vli.-tlifi- paia-itir (! lid i- 



(2) I KI:.M. \TKACK.\K. 



The apothecia are d.-velo],rd at lirst either under the sub- 

 -iiatum or alto-. -tlier superficially. The asco^.-noiis layer 

 extends over a thick hypothecium. 



The I )ci inateaceae contain the Cenangieae, Dermateae, /'"//- 

 lariacecu . and l:nl<i ,-'i,-< ae. 



CENANGIEAE. 



Apothecia at tir-t embedded, then e\p..M-d. They are sessile, 

 <'lavate or cone-shaped, and broaden mil to di-cs on opeiiii 



Cenangium. 



Apotln-cia globose; on dehix-i-nee at lir-l CUp-shaped, but 

 aftei-wai'ds llatter and inoiv saucer-shaped, with entire mar-in- . 

 they may occur -in-ly or massed lo-eth.-r. The club-shaped 

 asci contain ei-ht eult>iirle-<. olil.ni-, unicellular spores, and 

 tilann-ntoii- paiaphy-e- wilh thickened apices. 



Cenangium abietis < I 1 ' i >. i I'.iitain and I'.S. America. Thi- 

 fun-iis is usually a >api oph\ le. but Tlmnn-ii suggests il 83 an 



