HYPODERMKLLA. 



235 



apothecia were present on the upper surface of the needles as 

 isolated black spots or united into lines ; they dehisce by an 

 elongated fissure. The asci are cylindrical with rounded apices, 

 and measure about 110/U in length; they are almost sessile. 

 Each contained four hyaline, unicellular, club-sliaped spores 



Fio. 119. — Hypodermella sulcigeno.. The 

 apothecia form black lines on the needles. 

 Ascvis containing four spores (enlarged). 

 Single spore with a gelatinous covering 

 (still further enlarged). (Cop. from 

 Rostrup.) 



Fir;. \20.—Hypodtmiella lands. Larch- 

 needle with apothecia on the under side. 

 A, Paraphyse, and an a.scu8 containing 

 four spores. S, Isolated (enlarged) aaco- 

 .spore in its gelatinous coat. (v. Tubeuf 

 del.) 



(6G^ X 16/x) witli a gelatinous memluane. The paraphyses 

 are simple hyaline filaments, sliorter than the asci. 



Lophodermium. 



The olilong apothecia are embedded in the host-tis.sues under 

 a thin black cover, which breaks by a long fissure. The club- 

 sliaped asci contain thread-like unicellular spores, with a 

 mucilaginous membrane. The paraphyses are sometimes septate 

 and furnished with hooked or button-shaped ends. The spores 

 reach maturity on killed portions of plants, and are forcilily 

 ejaculated. The formation of pycnidia (spermogonia) precedes 

 tliat of apothecia. Many members of this genus are destructive 

 enemies of plants. 



Lophodermium pinastri (Schrad.).^ Pine-blight or needle- 

 cast. (Pjritain and U.S. America.) This disease of the Scots pine 

 (Fiiivs sylvestris) is very injurious to young plants, especially 

 those in nurseries. 



^Hartig, Diseases of Trees, Eng. edit., 1894. 

 Prantl, Flora, 1877 ; also, Forsticiss. Cenlralhlatt, 1880. 



