i82 PYRENOMYCETES [CH. y 



sometimes another group of Ascomycetes, seem on the whole to indicate no 

 very close relationship, but suggest rather that the Laboulbeniales were 

 derived from an ancestral form, already definitely ascomycetous but not 

 otherwise highly specialized, and that they have undergone elaborate and 

 characteristic modifications after branching off from the main line. Their 

 nearest affinities are with the Erysiphales and Pyrenomycetes. 



The resemblances between the Laboulbeniales and the Red Algae have 

 been regarded as significant in connection with the hypothetical relationship 

 of the higher Fungi to that group. 



LABOULBENIALES: BIBLIOGRAPHY 



1896 THAXTER, R. Contribution towards a Monograph of the Laboulbeniaceae, Pt. I. 



Mem. Am. Acad. Arts and Sciences, xii, p. 195. 

 1908 BIFFEN, R. H. First Record of Two Species of Laboulbeniaceae for Britain. Trans. 



Brit. Myc. Soc. iii, p. 83. 

 1908 THAXTER, R. Contribution towards a Monograph of the Laboulbeniaceae, Pt. II. 



Mem. Am. Acad. Arts and Sciences, xiii, p. 219. 



1911 FAULL, J. H. The Cytology of the Laboulbeniales. Ann. Bot. xxv, p. 649. 



1912 FAULL, J. H. The Cytology of Laboulbenia chaetophora and L. Gyrinidarufn. 

 Ann. Bot. xxvi, p. 325. 



