82 Transactions British Mycological Society. 



EUZODIOMYCES. 



E. Lathrobii Thaxt. in Proc. Amer. Acad, xxxv (1900), p. 449; Mon. (igo8), 



p. 444, pi. LXXI, fig. 23. 



On Lathrobium punctatum Zett. Notting Hill. B.M. No. 442. Co-type. 



In concluding I wish to acknowledge my great indebtedness 

 to Mr J. Ramsbottom for the kindly help and advice that he 

 has given me in the preparation of this paper. 



THE FUNGUS PRESENT IN LUNULARIA 

 CRUCIATA (L.) DUM. 



By W. F. F. Ridler, M.Sc. 



With six figures in the text. 



Historical Notes. 



Kny (1879) recorded that rhizoids of Lunularia and Mar- 

 chantia were frequently traversed by fungal hyphae, which 

 possessed cross walls, branched occasionally, and were sterile. 

 These hyphae did not reach the thallus tissue except in plants 

 growing on rich humus, where they entered the thallus and 

 ramified through it. 



Golenkin (1902) examined numerous species of Marchantia- 

 ceae, and recorded the occurrence of endotrophic mycorrhiza 

 in Marchantia palmata Nees, M. paleacea Bert., Preissia com- 

 mutata Nees, Targionia hypophylla L., Plagiochasma elongatum 

 Lindenb. and Gottsche and Fegatella conica Corda. He observed 

 that cultivated plants of Lunularia as well as other members 

 of the order were quite free from fungus and remained so 

 although infected plants of Marchantia palmata and M. paleacea 

 were grown in close proximity to them. 



Czapek (1889) stated that Fegatella, Marchantia,. and Lunu- 

 laria contain an antiseptic substance " Sphagnol " in combination 

 with the cell walls, which exerts an inhibitory influence on the 

 growth of bacteria and moulds; Cavers (1903) suggested that 

 the Sphagnol may serve to regulate the growth of the fungus, 

 and so prevent symbiosis from passing into parasitism. 



Presence of the Fungus. 



The examination of plants of Lunularia cruciata from various 

 situations has shown that, unlike those of Pellia which are 

 always inhabited by a fungus (Ridler, 1922), they may be 

 heavily or slightly infected by the fungus or quite free from it. 



