346 A Monograph of the Myxogastres. 



FIG. 22. Physarum cominnum, Mass. Two sporangia seated on the leaf of 



a moss, x 40. 



23. Spores and portion of capillitium of same, x 350. 

 24. Spore of same, x 1200. 

 25. Clathroptychium rugulosum, Rost. Aethalium with a portion 



removed to show the bright yellow spore-mass ; nat. size. 



26. Upper part of a sporangium showing the permanent, convex, 

 apical portion, b ; with its six descending threads, a ; corre- 

 sponding to the permanent angles of the lateral wall of the 

 sporangium, x 350. 

 ' 27. Spore of same, x 1200. 



28. Diagrammatic representation of a sporangium of same, showing 

 the perforations in the lateral wall, which ia reduced to the 

 angles. 



PLATE 2. 



FIQ. 29. Didymium farinaceum, Schrad., plant, x 40. 



30. Section of same, showing the columella, x 40. 



31. Portion of same, showing the capillitium radiating from the colu- 

 mella, a, to the wall of the sporangium, b, x 350. 



32. Portion of inner wall of sporangium passing over the colu- 

 mella, showing rib-like thickenings arranged in a reticulated 

 manner, x 350. 



33. Spores, x 350. 



34. Portion of a spore, x 1200. 



35. Crystals of lime from wall of sporangium, x 350. 



36. Chondrioderma difforme, Rost., plant, x 40. 



37. Section of same showing the outer calcareous wall, a, separated 

 from the thin inner wall, 6, by a space containing air, c, x 40. 



38. Threads of capillitium and spores of same, x 350. 



39. Lepidoderma fidvum, Mass., plants, x 40. 



40. Spores of same, x 350. 



41. Lepidoderma tigrinum, Rost., plant, x 40. 



42. Section of same, showing columella, x 40. 



43. Portion of capillitium and spores of same, x 350. 



44. Didymium microcarpa, Rost., a. niyripes ; plants, x 40. 



45. Spores of same, 350 ; a portion of a spore, x 1220. 



46. Didymium squamulosum, Fr., a. genuinum ; plant, x 40. 



47. Section of same, showing columella, x 40. 



48. Spores of same, 350 ; portion of a spore, x 1200. 



49. Didyminm squamulosum, Fr., var. costatum, Mass., plant, x 40. 



50. Didymium squamulosum, var. viryineum. Mass., plants, x 40. 



51. Section of same to show columella, x 40. 



52. Portion of capillitium and spores of same, . . 350 ; a portion of a 

 spore, x 1200. 



