_Lachnobolus occidentalis_ Macbr., p. 246.

Fig. 4. A cluster of sporangia, x 3; cylindric type.

Fig. 4 _a_. Capillitium, x 750; to show characteristic surface of the
threads.

_Arcyria denudata_ (Linn.) Pers., p. 253.

Fig. 5. Sporangia, two expanded, one still closed, x 20.

Fig. 5 _a_. A part of the capillitium of the same species, x 750.

_Arcyria nutans_ (Bull.) Grev., p. 249.

Fig. 6. Expanded capillitium, etc., x 10.

Fig. 6 _a_. Capillitium, x 750.

Fig. 6 _b_. A piece of the capillitium thread, x 1400.

_Ophiotheca wrightii_ Berk. & C., p. 241.

Fig. 7. A single sporangium, x 8.

Fig. 7 _a_. A node of the capillitial thread, x 750.

Fig. 7 _b_. A spore, x 750.

_Oligonema nitens_ (Lib.) Rost., p. 280.

Fig. 8. A single elater, x 750.

Figs. 8 _a_ and 8 _b_. Spores, x 1000.

_Badhamia macrocarpa_ Rost., p. 37.

Var. _gracilis_.

Fig. 9. Two sporangia, x 600.

[Illustration: PLATE II]

EXPLANATION OF PLATE III

_Hemitrichia clavata_ (Pers.) Rost., p. 264.

Fig. 1. Three sporangia, one closed, x 8.

Fig. 1 _b_. A single spore, x 1400.

_Hemitrichia vesparium_ (Batsch) Macbr., p. 262.

Fig. 2. Tip of the elater of capillitial thread, x 1400.

Fig. 2 _a_. A single spore, x 1400.

_Trichia iowensis_ Macbr., p. 269.

Fig. 3. A cluster of sporangia, x 5.

Fig. 3 _a_. Tip of a branching elater, x 750.

Fig. 3 _b_. A single spore, x 750.

See also Plate X., Fig. 5.

_Hemitrichia serpula_ Scop., p. 260.

Fig. 4. A plasmodiocarp, x 3.

Fig. 4 _a_. A single spore, x 1400.

Fig. 4 _b_. An elater-tip, x 1400.

_Trichia inconspicua_ Rost., p. 268.

Fig. 5. A cluster of sporangia, x 12.

Fig. 5 _a_. Tip of an elater, x 1400.

Fig. 5 _b_. A single spore, x 750.

_Physarum oblatum_ Macbr., p. 91.

Fig. 6. A single sporangium, x 20; stipe shown of unusual length.

Fig. 6 _a_. A single spore, x 1000.

See also Plate XIV., Fig. 3.

_Physarum auriscalpium_ (Cke.) Lister, p. 90.

Fig. 7. A single sporangium, x 20; a New York specimen.

Fig. 7 _a_. A single spore, x 1000.

_Arcyria nodulosa_ Macbr., p. 252.

Fig. 8. Capillitial thread, x 1200.

[Illustration: PLATE III]

EXPLANATION OF PLATE IV

_Trichia persimilis_ Karst., p. 271.

Fig. 1. Var. intermedia, x about 6.

Fig. 1 _a_. Spore of same species, x 1400.

Fig. 1 _b_. A second spore to show varying episporic network.

Fig. 1 _c_. Tip of elater, shows vertical connect