The Collemaceae of Ohio 
61 
where they are sometimes branched, 105 to 150 mic. long, cells 11 to 25 
mic. long and 4 to 6 mic. wide; spermagonia submarginal, horizontal 
diameter 190 to 265 mic., vertical diameter 212 to 250 mic.; basidia 14- 
to 20-celled, cells 3 to 5 mic. long and 3 to 4 mic. wide; spermatia 3.5 
to 5.5 mic. long and 0.8 to 2 mic. wide. See Fig. 25. 
Collema pidposum. Ascogonia 155 to 600 mic. below the surface, 
horizontal diameter 16 to 39 mic., vertical diameter 13 tO' 57 mic., 5- to 
many-celled, cells 9 to 13 mic. long and 4 to 6 mic. wide; trichogynes 
extending 17 to 24 mic. above the surface, where sometimes branched, 
155 to 625 mic. long, cells 8 to 54 mic. long and 6 to 8 mic. wide, distal 
cells much longer than others; spermagonia submarginal, horizontal 
diameter 65 to 240 mic., vertical diameter 75 to 240 mic.; basidia 7- or 
more-celled, cells 3 to 5 mic. long and 3 to 4 mic. wide; spermatia 1.5 
to 4 mic. long and 0.5 to 1 mic. wide. See Figs. 15, 16, and 21. 
Collema plicatile. Archicarps not seen; spermagonia numerous, 
commonly tinged with red, horizontal diameter 210 to 345 mic., vertical 
diameter 210 to 235 mic.; basidia many-celled, cells 5 to 6 mic. long and 
2.6 to 5 mic. wide; spermatia 5 to 7 mic. long and 1 to 1.5 mic. wide, 
often slightly curved, located on the ends and sides of the basidia. 
Collema microphyllum. Archicarps not seen; spermagonia sub¬ 
marginal, horizontal diameter 135 to 175 mic., vertical diameter 125 to 
140 mic.; basidia several-celled, cells 4 to 8 mic. long and 4 to 5 mic. 
wide; spermatia 2 to 3 mic. long and 0.5 to 1 mic. wide. 
Leptogiiim chloromelum. Ascogonia 60 to 95 mic. below the sur¬ 
face, horizontal diameter 18.5 to 24 mic., vertical diameter 26.5 to 29 
mic., many-celled, cells 8 to 10 mic. long and 3 to 5 mic. wide; trichogynes 
not seen; spermagonia submarginal, horizontal diameter 60 to 210 mic., 
vertical diameter reaching 250 mic.; basidia 4-to 8-or more-celled, cells 
2 to 6 mic. long and 3 to 5 mic. wide; spermatia 2 to 5 mic. long and 0.5 
to 1.3 mic. wide. See Figs. 19 and 22. 
Leptogium pulchellum. Ascogonia about 65 mic. below the surface, 
horizontal diameter about 14 mic., vertical diameter about 17 mic., 8-or 
more-celled, cells 7 to 8 mic. long and 5 mic. wide; trichogynes passing 
indirectly toward the surface, not fully studied; spermagonia marginal 
or submarginal, horizontal diameter 85 to 135 mic., vertical diameter 90 
to 120 mic.; separate basidia not found; spermatia 2.5 to 3.5 mic. long 
and 1 to 1.5 mic. wide. 
Leptogium lacerum. Ascogonia about 80 mic. below the surface, 
horizontal diameter about 18.5 mic., vertical diameter about 24 mic.. 
