120 



CARPOASCI. 



parenchymatons covering 1 of the ascocarp, enclosing one (Podo- 

 sphcera and Sphrerotheca ; compare Thelebolus among the Hemi- 

 asci) or a few asci (Fig. 108 c), which do not form any hymenium, 

 but are irregularly placed. The cells of the ascocarp-envelope 

 are often prolonged into hair-like appendages. The ascocarps are 

 developed from the mycelium at places where two hyphre ci-oss 

 each other (Fig. 107). At these places two short and erect hyphte 

 are produced side by side. The one from the lower hypha (Fig. 

 107 o) assumes an ellipsoidal shape, and is known as the arclticarp 

 or ascogone, while the other (" pollinodium ") arches over the 



FIG. 103. Ei-ysiphe communis. A small portion of a leaf with this Fungus growing upon 

 it (considerably magnified). The hyphse 6 and d do not belong to this Fungus, but are re- 

 productive organs of a pyrenomycetons Fungus parasitic upon it (Cicinnobotus). 



ascogone. 



From the latter one ascus may be at once developed 

 (Sphcerotheca, etc.), or after its division several asci may be pro- 

 duced, each developed from one division. The sterile hypha 

 (termed " pollinodium," since it was formerly, but erroneously, 

 supposed to fertilise the ascogone) produces a number of branches, 

 and forms the pseudo-parenchymatous envelope of one cell in 

 thickness, enclosing the asci. 



Many plants, both cultivated and wild, are attacked by various 



