Roots in some gymnospermic genera have fungal association in the form of $A$ in $B$. Here,$A$ and $B$ refer to:
- A$A$-mycorrhiza; $B$-$Pinus$
- B$A$-mycorrhiza; $B$-$Cycas$
- C$A$-lichen; $B$-$Pinus$
- D$A$-lichen; $B$-$Cycas$
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