COMPARISON OF NATURAL ECTOMYCORRHIZAS BET WEEN BEECH (FAGUS-SYLVATICA) AND 2 FUNGI (LACTARIUS-BLENNIUS VAR VIRIDIS AND LACTARIUS-SUBDULCIS).1. MORPHOLOGICAL AND CYTOLOGICAL CHARACTERISTICS

Lactarius blennius var viridis and L subdulcis form smooth ectomycorrh izas with beech roots. These mycorrhizas present large differences in organization. Fungal mantles show different structures. The Hartig net is normally developed in L subdulcis and is discontinuous in the othe r species. Both mycorrhizas contain many laticifers and intracellular hyphae in the roof cell of beech. L subdulcis mycorrhizas are frequent ly infected by an ascomycete whose hyphae are present equally in the m antle and the root cortex.