While usually remotely gregarious a collection from southern California shows that on occasion the entire plasmodium may pass to fruit with narrowest limits, forming a stipitate, compact, globose mass of crowded, superimposed sporangia as in Oligonema nitens. Set Plate XX., Fig. 12.
12. Arcyria insignis Kalkbr. & Cke.
- 1882. Arcyria insignis Kalkbr. & Cke., Grev., X., p. 143.
- 1911. Arcyria insignis Kalkbr. & Cke., List., Mycet., 2nd ed., p. 240.
Sporangia gregarious or clustered, pale or bright rose-colored, .5–1.5 mm. in height, stipitate, ovate or cylindric; stipe short, .2–.4 mm. red, with spore-like cells; capillitium a close net-work of delicate threads with a few bulbous free ends, with faint transverse bands or short spinules, or nearly smooth, colorless beneath the lens; spores colorless, nearly smooth, 6–8 µ.
Reported from Mass. by Miss Lister. Should follow No. 8: apparently a very delicate form of the common species, A. denudata.
3. Heterotrichia Mass.
- 1892. Heterotrichia Mass., Mon., p. 139.
Sporangia distinct, stipitate; the peridium simple evanescent above as in Arcyria; capillitium centrally attached, freely branched, the threads within very slender, without broad, anastomosing to form a dense peripheral network, and everywhere extended to form short, free, often hamate tips. A single species,—
1. Heterotrichia gabriellae (Rav.) Mass.
[Plate XIII.], Figs. 1, 1 a.