18. Sphagnum (Dill) . Hedwis

(Fig. 6A, B)

Radial spore, subtriangular polar view, with rounded angles and slightly convex sides. Thick exospore. Heteropolar, trilete with fine long arms bifurcate at extremities on laevigate proximal face. Coarse, irregular trilobate thickening on the distal pole. Equatorial diameter ca. 50–65 µm (x 62 µm). Ecological data: plants more characteristic of bogs, forming extensive spongy masses; also occurs in other humid places. Color ranges from green to red in response to pH (Watson, 1968).