In situ and Ex situ Conservation of Commercial Tropical Trees - ITTO

498Figure 2. Two typical ectomycorrhiza commonly found in Bukit Bangkirai,East Kalimantan. I: Irregularly pinnate with abundant formation ofextramatrical hyphae II: Monopodial pinnate without significantamount of extramatrical hyphae. a,b: Gross morphology of theectomycorrhiza (blue arrow: ectomycorrhizal root tips), c: Cross &longitudinal section of ectomycorrhizal root (black arrow: mantle;white arrow: Hartig net; dashed arrow: extramatrical hyphae)I.a. I.b. I.c.II.a. II.b. II.c.The presence of ectomycorrhizae on the unburnt control and the LB sitesprobably supports the statement that ectomycorrhizal associations are obligatoryfor dipterocarps (Yasman 1996). The HB site that has been regenerated tomany shrub and tree species but not to dipterocarps did not containectomycorrhizae.In contrast to ectomycorrhizal fungi, endomycorrhizal fungi were found on allsites. The spore numbers of endomycorrhizal fungi were similar on all sites,although on the SB site numbers were slightly greater (Table 1). The generacommonly found were Glomus and Acaulospora. Endomycorrhizal infectionvaried, being greatest on the control site, less on the LB site, and least on theSB site (Table 1). In these associations only arbuscules were found (Figure 3).No vesicle was observed in the roots.