Figure 1: Liverwort M. paleacea gametophyte colonized by glomeromycete endosymbionts.
From: Mutualistic mycorrhiza-like symbiosis in the most ancient group of land plants
(a) Thallus cross-section showing cells with red pigmented walls colonized by glomeromycete fungi, below the green photosynthetic tissue and above the rhizoids extending below the central axis, (b) uncolonized thallus lacking red pigmentation and (c) arbuscule released from the edge of a longitudinal section through the fungal-colonized part of the thallus, stained with Trypan blue. (d) Neighbour-joining distance tree of fungi based on 960 bp of 5′ 18S nuclear ribosomal DNA sequences. Bootstrap percentages are shown below branches. Glomus group Ab was rooted with members of Glomus group C (Glomus versiforme, Diversispora spurca) and Acaulosporaceae (Acaulospora spp., Entrophospora sp.). Scale bar in (a) and (b) is 250 μm and in (c) is 50 μm.
