Fig. 2. A cluster of sporangia, magnified about 15 times. Fig. 2 _a_. The tip of an elater of the same species, x 1000. Fig. 2 _b_. A single spore, x 1000. Fig. 2 _c_. A bit of the sporangium wall, x 600. _Stemonitis pallida_ Wing., p. 169. Fig. 3. Sporangia, magnified about 5 times. _Comatricha pulchella_ (Bab.) Rost., form _C. persoonii_ R., p. 183. Fig. 4. Sporangia, magnified about 15 times. See Addenda, d, p. 283. _Stemonitis carolinensis_ Macbr., p. 170. Fig. 5. Sporangia, magnified about 5 times. _Clastoderma debaryanum_ Blytt., p. 191. Fig. 6. Sporangium, magnified about 60 times. _Trichia contorta_ Rost., p. 269. Fig. 7. Tip of an elater, x 1400. Fig. 7 _a_. Spore of the same species, x 1400. _Trichia botrytis_ Pers., p. 274. Fig. 8. Tip of the elater, x 1400. Fig. 8 _a_. Spore of the same species, x 1400. [Illustration: PLATE XIII] EXPLANATION OF PLATE XIV _Badhamia magna_ Peck., p. 38. Fig. 1. A cluster, of sporangia, x 10. _Cienkowskia reticulata_ (Alb. & Schw.) Rost., p. 111. Fig. 2. Plasmodiocarp, x 15. Fig. 2 _a_. A bit of the capillitium of the same, x 800. Fig. 2 _b_. A single spore, x 1000. _Physarum oblatum_ Macbr., p. 91. Fig. 3. Sporangia, x 15. Fig. 3 _a_. A piece of capillitium, x 800. Fig. 3 _b_. A single spore, x 1000. The roughness much exaggerated. _Badhamia orbiculata_ Rex., p. 37. Fig. 4. A group of sporangia, x 10. _Physarum newtoni_ Macbr., p. 73. Fig. 5. A group of sporangia, x 16. Fig. 5 _a_. A single spore, x 1000. Fig. 5 _b_. A bit of the capillitium, x 800. _Physarum maculatum_ Macbr., p. 77. Fig. 6. A cluster of sporangia, x 10. Fig. 6 _a_. A piece of the capillitial net, x 800. Fig. 6 _b_. A single spore, x 800. _Lepidoderma tigrinum_ (Schrad.) Rost., p. 145. Fig. 7. A group of sporangia, x 20. [Illustration: PLATE XIV] EXPLANATION OF PLATE XV _Physarum confertum_ Macbr. _n. n._, p. 64. Fig. 1. Sporangia on a bit of leaf, x 4. Fig. 1 _a_. Capillitium, x 800. Fig. 1 _b_. A single spore, x 1200. _Physarum notabile_ Macbr., p. 80. Fig. 2. A group of sporangia, stipitate form, x 10. Fig. 2 _a_. A single spore, x 1200. _Physarum flavicomum_ Berk., p. 93. Fig. 3. A cluster of sporangia, one closed, x 10. Fig. 3 _a_. A single spore, x 1200. _Physarum tropicale_ Macbr., p. 82. Fig. 4. Sporangia, x 10. Fig. 4 _a_. Capillitium, x 800. Fig. 4 _b_. A single spore, x 1200. _Craterium minutum_ (Leers) Fr., p. 107. Fig. 5. Sporangia, the stalks unusually long, x 15. _Physarum penetrale_ Rex, p. 70. Fig. 6. A group of sporangia; the calcareous crust has fallen in all. Fig. 6 _a_. A single sporangia, enlarged to show columella, x 20. _Physarum nicaraguense_ Macbr., p. 83. Fig. 7. A group of sporangia, x 15. Fig. 7 _a_. Capillitium, strongly calcareous, x 800. Fig. 7 _b_. A single spore, x 1200. See also Pl. XVII., Figs 11 and 11 _a_. [Illustration: PLATE XV] EXPLANATION OF PLATE XVI