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POPULAR SCIENCE REVIEW. 
Figs. 24-29. Didymium, Fries. ( After Cienkowski.) 
Fig. 24. Matured sporangium developed in a reticulate form over a living 
leaf of ground ivy ( Glechoma hederacea), natural size. 
Fig. 25. Portion of matured erect branching plasmodium. Nat. size. 
Figs. 26-29. Monadiform and amoeboid germs, that at 28 with i i, ingested 
food particles, x 550. 
Figs. 30-55. Physai'um tussilaginis, B. and Br. (From the writer’s original 
drawings.) 
Fig. 30. Three matured sporangia adherent to a leaf of common coltsfoot. 
( Tussilago farfara), x 5. 
Fig. 31. Isolated sporangium, x 10. 
Fig. 32. A small sporangium in lateral view ; towards the extremity a, the 
spores having escaped, have left bare the thin membranous 
wall, with its externally scattered calcareous spicula, x 30. 
Fig. 33. Margin of membranous wall of sporangium, with on the upper 
surface equidistantly dispersed spicula, and on the under one 
delicate branching capillitium threads, x 100. 
Fig. 34. Fragment of sporangial membrane with scattered spicula as seen in 
superficial view, x 100. 
Fig. 35. An isolated hexradiate-stellate spiculum from the sporangial mem- 
brane, x 400. 
Figs. 36-39. Germinating spores showing different stages of development, 
x 800. 
Figs. 40-42. Spores with their walls ruptured, giving exit to amcebiform 
germs ; at 42 an abnormal example containing two germs, x 800. 
Figs. 43-48. Successive phases of development of a single extruded germ 
to a free-swimming monad, as described at page 111, x 800. 
Figs. 49, 50. Two free-swimming monads, in the former one the vacuoles at 
if contain exceedingly minute injected carmine particles; the 
example at 50 with larger, and scattered ingested granules of the 
same pigment, x 800. 
Figs. 51, 52. Monads that have entered upon a repent amoebiform existence, 
the flagella as 3 r et being retained ; the example at 52 with ingested 
carmine particles, x 800. 
Figs. 53-55. Repent amcebiform zooids, or young plasmodia, representing 
ulterior developmental phases of the preceding free-swimming 
monads ; the examples 54-55, with numerous ingested carmine 
particles, x 800. 
