Over 4000 records of the six European v4rwz//i2rM species were compiled to give distribution maps and host lists for each species. Differences in eeographical and altitudinal distribution, pathogenicity, dissemination and ecological role are discussed.

The systematics of the Armillaria mellea complex. Phytopathological consequences. The five biolo‐gical species of the Armillaria complex as defined by Korhonen coincide with species already defined by other authors on the basis of their morphology and have been given latin namenelature. The main characteristies of the five Eurmpean species are deseribed: Fruitbody morphology, myce‐lium morephology in loboratory culture, rhizomorphs grown in a rhizotron and the ease with which fruithodies are produced in the laboratory. A descriptiom is given of the geographical distribution ecological specialisation and pathogenicity of these 5species.

Etude de la specialisation d'Armillaria mellea (Vahl) Kumm. et Armillaria obscura (Seer.) Herink en phase saprophytique et en phase parasitaire Par J. j. (JUIIJ.AUMIN et BIUGIITI-I.UNC Abstract Investigation into the spcciali.sation of Armillaria obscura and Armillaria mcllca. Twci l.solatc.s of A. ifii'llca proved more aggressive than two ol /I. obscura as rcj;arcls vino, peach and nortlKTii otk InvcrscI)', the i.solatcs of obsciirti were mtjre a^^gressive than those ol Jiicllca tt)war(.Ls Niirway spnieo aiitl Maritime pine.On the other hand no type ol speciahsation wa.s lound when invcstii^aliiij; the sapiophyiic phase: oak wood is betler than pine wood as rei;nrds ihi/.oinorph produelion lor A. obsciira as well as A. mcllca