302 



COMPARATIVE MORPHOLOGY OF FUNGI 



while the outside of the flat stroma has no direct connection with the sub- 

 strate. In contrast to the Stigmateaceae, the basal layer of the stroma 

 is dark, and hence definitely recognizable as such. Again, differing 

 from Stigmatea Robertiani and like the Munkielleae, the numerous radial 



Fig. 199. — Hysterostomella discoidea. Section of ascus stroma on lower surface of leaf. 



(X 250; after Arnaud, 1918.) 



1 



Fig. 200. — Cycloschizon Alyxiae. 1. Lower surface of Alyxia leaf with ascus stroma. 2. 

 Part of surface of young ascus stroma. (1 X^;2,3 X 250; after Arnaud, 1918.) 



loculi, generally under the same covering layer, are irregularly sinuous, 

 recurved and often forked acutely. 



Cycloschizon Alyxiae (Maurodothis Alyxiae, Dielsiella Alyxiae) in 

 Australia and Tasmania is parasitic on the leaves of Alyxia buxifolia. 



