Fig. 2 b. Persistent apices of the peridia.

Lindbladia effusa (Ehr.) Rost., [p. 204.]

Fig. 3. A group of sporangia, × 30.

Fig. 3 a. A single spore, × 1400.

Tubifera ferruginosa (Batsch) Macbr., [p. 206.]

Fig. 4. A group of sporangia, × 5.

See also [Plate VII]., Fig. 8; and [Plate XII]., Fig. 14.

Cribraria dictydioides Cke. & Balf., [p. 222.]

Fig. 5. Three sporangia, × 15.

Fig. 5 a. A single sporangium, to show reticulate thickening, × 60.