Fig. 16. Microsomyces psammoechi Thaxt. A. General habitus with several thalli corticating on host integument. B. Three sporelings with labelled receptacle cells (I, II, and III), the primary septum (a), and a primary antheridium (an). C. Ascospore. D. Young thallus showing cell I, one corticated cell (cc), and the primary antheridium (an) with spinose remaining of ascospore apex (sx). E–F. Haustoria penetrating the host body (arrows). Scale bars: A, D–F = 50 µm; B = 20 µm; C = 25 µm. Photographs from slides ZMUC C-F-124046 (A, C–F), ZMUC C-F-123679 (B).