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 connecting bands. _Trichia decipiens_ (Pers.) Macbr., p. 276. Fig. 2. Sporangia, x about 8. Fig. 2 _a_. A spore of the same species, x 1400. Fig. 2 _b_ and 2 _c_. Elaters of the same species, x about 225. _Trichia varia_ (Pers.) Rost., p. 270. Fig. 3. Sporangia, x about 8. Fig. 3 _a_. A spore of the same species, x 1000. Fig. 3 _b_. An elater of the same species, x 750. _Trichia scabra_ Rost., p. 271. Fig. 4. Sporangia, x about 8. Fig. 4 _a_. A single spore of the same species, x 1400. Fig. 4 _b_. An elater-tip of the same, x 1400. _Trichia favoginea_ (Batsch) Pers., p. 272. Fig. 5. Sporangia, x about 8. Fig. 5 _a_. A single spore of the same, x 1400. Fig. 5 _b_. A single elater-tip of the same, x 1400. _Trichia persimilis_ Karst., var _abrupta_ Cke., p. 271. Fig. 6. An elater-tip, x 1400. It will be noticed that the spirals are connected by vertical bars. Fig. 6 _a_. A single spore of the same variety, x 1400. Fig. 6 _b_. A single spore, from the same sporangium as 6 _a_. Fig. 6 _c_. Trichia persimilis, a single spore, x 1400. Fig. 6 _d_. Tip of an elater from the same, x 1400. [Illustration: PLATE IV] EXPLANATION OF PLATE V _Lamproderma arcyrionema_ Rost., p. 197. Fig. 1. A single sporangium seen as if in section, x 40. Fig. 1 _a_. A single spore, x 1400. _Lamproderma scintillans_ (Berk. & Br.) List., p. 195. Fig. 2. A single sporangium seen as in section, x 40. Fig. 2 _a_. A single spore, x 1400. _Enerthenema papillatum_ (Pers.) Rost., p. 190. Fig. 3. An expanded, blown-out sporangium, x 25. _Lamproderma robustum_ Ell. & Ev., p. Fig. 4. A sporangium seen as in section, x 20. Fig. 4 _a_. A single spore, x 1000. _Comatricha laxa_ Rost., p. 177. Fig. 5. A sporangium seen as if in section, x 40. Fig. 5 _a_. A single spore, x 2000. _Diachaea thomasii_ Rex, p. 188. Fig. 6. Three sporangia magnified about 15 times. Fig. 6 _a_. A single spore of the same species, x 800. _Brefeldia maxima_ (Fries) Rost., p. 154. Fig. 7. A group of sporangia, showing columellae; x 5. Fig. 7 _a_. Capillitial threads of the same species, x 300. Fig. 7 _b_. Spore of the same species, x 1500. _Amaurochaete fuliginosa_ (Sowb.) Macbr., p. 149. Fig. 8. A bit of so-called capillitium, x 300. Fig. 8 _a_. A single spore magnified about 1000 times. [Illustration: PLATE V] EXPLANATION OF PLATE VI _Comatricha typhoides_ (Bull.) Rost., p. 181. Fig. 1. A group of sporangia, x 5. Fig. 1 _a_. A single spore, x 1600. Fig. 1 _b_. Tip of the columella with its branches, x 50. _Comatricha longa_ Peck, p. 175. Fig. 2. A single empty sporangium, x 6. Fig. 2 _a_. A part of the same taken near the apex, x 60.