86 FETCH : 



fungus is growing. Nectria liaematococea, for example, has no 

 stroma when growing on wood or bark, as a rule ; but when it 

 grows on a cacao pod, it frequently first covers the latter with 

 a layer of mycelium and conidiophores, and the perithecia 

 which subsequently develop would, under the terms postulated, 

 be regarded as stromatic. 



Saccardo's subdivisions are, however, unsatisfactory, in 

 that they are not mutually exclusive. A Nectria which, 

 according to the structure of its perithecial wall, is Lepido- 

 nectria, may be seated on a byssoid subiculum, and con- 

 sequently be Hyphonectria. Cooke appears to have had this 

 idea in mind in his classification of the genus Nectria in 

 Grevillea, XII., and his subsequent employment of a double 

 generic name, e.g., Dialonectria (Nectriella) gigaspora 

 (Grevillea, XVII., p. 42). 



The genus Ophionectria Sacc. {=Tubeufia Penz. & Sacc.) has 

 been divided by Seaver into Ophionectria, containing those 

 species lacking a stroma, and a new genus, Scoleconectria, 

 containing those species provided with a stroma. Two 

 species of Ophionectria are known to occur in Ceylon, O. 

 trichospora B. & Br., and Ophidnectria coccicola Ell. & Ev. 

 The former is the type species of the genus Ophionectria, while 

 the latter is included by Seaver in Scoleconectria. The stroma 

 of Ophionectria coccicola is a thin byssoid layer, slightly 

 elevated where it grows over a scale insect, but frequently 

 quite plane. Ophionectria trichospora, however, has also a 

 thin byssoid stroma, though, as it is not parasitic on scale 

 insects, the stroma is nowhere elevated. Seaver's generic 

 distinction consequently fails. 



Throughout the Hypocreacese Thwaites's specimens were 

 mixed up in a most unaccountable manner. A conceivable 

 solution is that it was the work of a native collector, who put 

 together everything he gathered in a given locality. Thwaites 

 apparently effected a partial separation, but the numbers were 

 still mixtures when they reached Berkeley and Broome, and, 

 in many instances, the type specimens are mixtures still. 

 Therefore, it is necessary to exercise more than ordinary caution 

 in examining these type specimens, for any one of them may 

 contain as many as five species. 



