The North American Slime Moulds A Descriptive List Of All Speci
Chapter 4
non-calcareous. 26. _P. penetrale_
iii. Columella large globose 27. _P. luteo-album_
_b._ Sporangia without columella.
i. Sporangia nucleate, calcareous at center.
O Stipe yellow 28. _P. nucleatum_
OO Stipe white 29. _P. wingatense_
ii. Sporangia non-nucleate.
O Sporangia purple 30. _P. newtoni_
OO Sporangia blue, spotted with red 31. _P. psittacinum_
OOO Grey or white, iridescent betimes.
o Sporangia white, discoidal; stipe yellow 32. _P. discoidale_
oo Sporangia lightly calcareous, iridescent, sub-globose, diam. about = to the stout, brown, slightly wrinkled stipe 33. _P. leucophaeum_
ooo Sporangia globose or sub-globose.
x. Small, .5 mm.
+ Stipe erect, clear brown 34. _P. nodulosum_
++ Stipe weak, yellow, stuffed 35. _P. maculatum_