m_

B. Sporangia, at least some of them, stipitate.

_a._ Sporangia columellate.

i. Columella small, usually conical.

O Sporangium yellow.

o Columella white 19. _P. melleum_

oo Columella yellow 20. _P. citrinum_

OO Sporangium not yellow.

o Capillitial mass persistent.

+ Sporangia globose,
pallid or white 21. _P. globuliferum_

++ Sporangia blue or lilac,
rose, etc. 22. _P. lilacinum_

+++ Sporangia drab or brownish 23. _P. murinum_

++++ Sporangia wine-red 24. _P. pulcherrimum_

oo Capillitial-mass less
persistent; orange 25. _P. pulcherripes_

ii. Columella long, 4-5 the sporangium
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_

xx. Larger, lime-capped; stipe
strand-like 36. _P. didermoides_