Soral hyphae of <i>Entorrhiza casparyana</i> in root galls of <i>Juncus articulatus</i>, as seen by TEM.

<p><b>(a)</b> Section through an intercellular hypha surrounded by plant cells. <b>(b)</b> Section through an intercellular hypha extended into a cortical cell. Note that the intracellular part of the hypha is surrounded by the host plasma membrane. <b>(c)</b> Section through two hyphal coils in neighbouring cortical cells of <i>J</i>. <i>articulatus</i>. One host nucleus is visible at N, and a hyphal septum is visible at the arrow. <b>(d)</b> Section through a hyphal septum showing a dolipore without membranous caps (arrow). Note the basidiomycetous tripartite profile of the septum wall. Scale bar is 1 μm in (a-b), 2 μm in (c), and 0.1 μm in (d).