Ectomycorrhizas and putative ecto‐mycorrhizal fungi of Afzelia africana Sm and Uapaca guineensis Müll. Arg. in southern Senegal

Abstract

Summary Ectomycorrhizas and ectomycorrhizal fungi of Afzelia africana Sm. and Uapaca guineensis Müll. Arg. are reported in forests of southern Senegal. Ectomycorrhizas occurred in dry and wet conditions, at different soil contents of available phosphorus (0–17.5 μg g−1). U. guineensis was confined to groundwater forests. Individual trees had both ecto‐ and endomycorrhizas, A. africana grew scattered in semi‐evergreen and riverside forests, whereas in the woodland it formed larger patches and could dominate the canopy. Eighteen putative ectomycorrhizal fungi grew under U. guineensis and thirty‐one under A. africana. Only six species were common to both trees, indicating an ecological and/or taxonomical selection. The fungi belonged to the following Orders: Russulales (16), Boletales (11), Agaricales (9), Cantharellales (2), Selerodermatales (2), Hymenogastrales (1), Gautieriales (1), Aphyllophorales (11). Some of them had a wide Sudano‐Zamhezian or Guineo‐Congolian distribution and reached their northern limit in Senegal.

The dynamics of ectomycorrhizal infection of Shorea leprosula seedlings in Malaysian rain forests

“…This has also been noted for Afzelia africana and Vapaca guineensis (Thoen & Ba, 1989) and oak (Newton & Pigott,199]). A question arises about the nature of carbon flow in mycorrhizas formed before leaf expansion.…”

“…Three (T9, TIO, Til) of the fungi in Table 2 produced hyphal strands, which might be thought to increase inoculum potential and competitive ability. Newton (1991) found tbat the most consistently abundant fungi on oak and birch seedlings were strand formers, and Thoen & Ba (1989) noted tbat mycelial strands were present in more than 60 'o of mycorrhizas of Afzelia africana and Uapaca guineensis. On the other hand the Russulaceae were also an important constituent of the mycorrhizal flora of the dipterocarp seedlings and, in general, members of Russulaceae produce few strands.…”

Ectomycorrhizas of Coltricia and Coltriciella (Hymenochaetales, Basidiomycota) on Caesalpiniaceae, Dipterocarpaceae and Myrtaceae in Seychelles

“…The morphological and anatomical characters of Coltricia and Coltriciella EcM presented here resemble brief descriptions of C. perennis and C. cinnamomea EcM (Danielson 1984;Thoen and Ba 1989). Thus, Coltricia and Coltriciella spp.…”

“…In addition, fertile basidia formed in pure culture, which raised further doubts as to the true EcM lifestyle of C. perennis (Danielson 1984). Following mycelial connections in situ, Thoen and Ba (1989) identified brown, bristly EcM of Coltricia cinnamomea (Pers.) Murr.…”

Do concentrations of glucose and fungal inoculum influence the competitiveness of two early-stage ectomycorrhizal fungi in Afzelia africana seedlings?

“…It plays a major role in the biology and ecology of forest trees, affecting growth, water, and nutrient absorption. In West Africa, native ectomycorrhizal trees are distributed in dry woodlands and gallery forests and include some members of cesalpinoid legumes, Euphorbiaceae, and Dipterocarpaceae (Thoen and Bâ, 1989;Thoen and Ducousso, 1989;Sanon and Dexheimer, 1997). Among the ectomycorrhizal African trees, Afzelia africana is considered as one of the most important timber species for reforestation of West Africa (Thies, 1995).…”