21 8 INTRODUCTION TO THE STUDY OF FUNGI 



the subgenus Didymella uniseptate, and in Metasphaeria 

 multiseptate. The small genus Ophiobolus corresponds to the 

 genus Raphidospora in the Caulicolae, in which the sporidia 

 are filiform. Of genera with coloured sporidia Anthostoma 

 includes those which are continuous ; and Didymosphaeria 

 those in which the sporidia are uniseptate. Leptosphaeria has 

 the sporidia multiseptate, but the coloration is often very 

 slight. Other species of Leptosphaeria, which grow on 

 herbaceous plants will be found under Heptameria in the 

 Caulicolae ; in fact, the separation of the two families Obtectae 

 and Caulicolae is a purely arbitrary one. Delacourea, again, 

 includes such species of Pleospora as are found growing on the 

 twigs of trees and shrubs, having coloured muriform sporidia. 



The fifteenth subfamily, Caulicolae, includes such species as 

 conform in habit to Obtectae but are found on the dead stems 

 of herbaceous plants. In the genus Phomatospora the sporidia 

 are continuous and hyaline, hence corresponding to Physalo- 

 spora. In Apiospora the rather unusual form of sporidia is 

 found in which, though practically uniseptate, the lower cell is 

 small, consequent on the septum being placed near the base. 

 In Didymella the sporidia are uniseptate and hyaline, and 

 correspond to the subgenus Didymella of Endophlaea. Meta- 

 sphaeria is a large and important genus of Caulicolae, in which 

 the sporidia are multiseptate and hyaline. Raphidospora in- 

 cludes such caulicolous species as possess very long thread-like 

 sporidia, which may or may not be divided by transverse 

 septa into short joints. Of species which have coloured 

 sporidia those in which the sporidia are continuous will be 

 found in the genus Anthostomella, those with the sporidia 

 uniseptate in Didymosphaerella, and with the sporidia multi- 

 septate in Heptameria, corresponding to Leptosphaeria. This 

 is one of the largest genera on herbaceous plants. Pleospora 

 is a well-known genus in which the peritbecia are often 

 large, and become erumpent. The sporidia are muriform and 

 coloured. Some species or other may be anticipated on the 

 dead stem of almost any herbaceous plant. The genus Pyreno- 

 phora differs from Pleospora in the perithecia being selulose, 

 but the sporidia the same (Fig. 102). 



The sixteenth subfamily is the Foliicolae, which, as the 



