266 INTRODUCTION TO THE STUDY OF FUNGI 



muriform, consist almost absolutely of one type, that of 

 Camarosporium, which resembles Hendersonia in habit and 

 appearance, growing npon branches, covered by the cuticle. 

 Cijtosporium only differs in the perithecia being subsuper- 

 ficial, growing on naked wood. Dichomera, in which the 

 perithecia are immersed in a stroma, as in Dothideaceae, is 

 consequently compound. The doubtful genus Endohotrya, 

 contains but one species, which is North American. 



A rather important section is the Scolecosporae, in which 

 the sporules are very much elongated, 

 so as to be thread-like, or rod-like, and 

 either hyaline or faintly coloured. The 

 principal genus is Septoria, of which 

 the species are in greater part parasitic, 

 growing on living leaves or the green 

 parts of plants. The minute perithecia 

 are flattened and innate, and typically 



Fig. 122.— Prosfhemium . i j- ^ i • 



section with sporules. aggregated upon discoloured spots. 

 This genus is analogous to Pliyllosticta, 

 from which the species cannot be distinguished except 

 by the sporules. There is a suggestion of genetic con- 

 nection between some of the species and the ascigerous 

 genus Sphaerella, but this has not been demonstrated. 

 Fhlaeospora includes such species as would otherwise find a 

 place in Septoria, were not the sporules thickened, and com- 

 paratively shorter. Hhahdosjjora scarcely differs from Sep)toria 

 except that the perithecia are not seated on discoloured spots, 

 and are confined to twigs and the stems of herbaceous plants. 

 It bears about the same relation to Septoria that Phoma does 

 to Pliyllosticta. Phlyctaena would otherwise be the same as 

 Ehahdospora, only that the perithecia split with a fissure, and 

 become deficient above. In the small genus Gelatinosporium, 

 the perithecia dehisce broadly and irregularly, the sporules in 

 the interior forming a gelatinous mass. There are two genera 

 in which the perithecia are distinctly rostrate as in Sj^haero- 

 nema, from which genus the species have been separated, on 

 account of the difference in the sporules : Sphaerograpliium, in 

 which the sporules are continuous ; and Cornularia, in which 

 they are septate. Of the three compound genera, Uriosjjora 



