Rare. Pennsylvania, South Carolina, Missouri, Iowa; Black Hills, South Dakota.

4. Cribraria rufa (Roth) Rost.

[Plate XIX]., Fig. 8.

Sporangia scattered, sub-globose or turbinate, dark or reddish orange, .5–.7 mm. in diameter, erect, stipitate; stipe about equalling the height of the sporangium or longer, dark brown or black; calyculus one-third to one-half the sporangium, the margin toothed, the wall ribbed and continuous with the open wide-meshed net; the network deep yellow or orange, the threads flattened; the nodes not thickened, little differentiated; spores concolorous, by transmitted light, pale yellow, verruculose, 5–7 µ.

Similar to the preceding, but generally much larger and not so much inclined to brown. The size, however, is extremely variable in sporangia from the same plasmodium (reported white), some no larger than those of the species reckoned most minute.

Oregon. Professor Morton Peck.

5. Cribraria splendens (Schrader) Rost.

[Plate XIX]., Fig. 10.