NECTRIA. 



185 



Nectria. 



Perithecia yellow or red in colour, and generally produced 

 in close tufts on stromata of the same colour. The asci con- 

 tain eight bicellular spores and few or no paraphyses. Conidia 

 ■of various kinds and shapes are also produced. 



Nectrina cinnabarina Fr.^ (Britain and U.S. America). The 

 -bright-red, button-shaped conidial cushions of this fungus may 



Fig. 77. — Nectna cin^iabari^ia, with peri- 

 thucia on the dead bark of a still-living 

 stem of Elm. Infection has evidently 

 hegun at the wound of a cut branch near 

 the middle, and extended outwards, (v. 

 Tubeuf phot.) 



Fig. 78. — Nectria. cinnabaHna. Portion of 

 branch (magnified). Light-coloured cushions 

 of conidiophores with conidia are breaking out 

 towards the upper end, and colonies of hard 

 red perithecia towards the lower end. (After 

 Tulasne.) 



be found almost at any time on the dead branches of many 

 deciduous trees, e.g., Aesculus, Acer, Tilia. Morus, Ulmus, etc.; 

 also on Lonicera, Samiucus, Bdbinia, and Pyrus, in America.^ 



' Tulasne, Sdect fung., 1865. 



^Behrens (Zeitsch. f. P/lanzenhranlcheiten (1895) ascribes to Nectria the very 

 common tuberous swellings on the twigs of Abies halsamea ; these, however, 

 may arise without the agency of the fungus. 



