66 
Ohio Biological Survey 
EXPLANATION OF PLATE IV. 
Fig. 0. A section through an apothecium of Collema pulposum, showing a portion 
of the hypothecium of interwoven hyphse below and the lower portions of 
three asci and several paraphyses above, x 1,000. 
h'ig. 10. A portion of a section showing a few cells of a medullary hypha and three 
cells of the plectenchyma in the lower portion of the hypothecium of 
Collema microphyllum. x 1,000. 
Fig. 11. Three types of branching of paraphyses in Synechoblashis pycnocarpiis. 
X 580. 
I''ig. 12. Three paraphyses of Synechoblastus mgrescens, showing two of the bridge¬ 
like anastomoses sometimes seen in this species and a branch arising from 
the middle paraphysis. x 580. 
Fig. 13. Types of spores found in the Collemaceae; a, 2-celled spores of Syneclio- 
blastus ohioensis; h and c, several-celled spores of Synechoblastus haccidiis 
and Synechoblastus nigrescens; d, e, f, g, h, and i muriform spores of 
Collema pulposum (d), Collema microphyllum (e), Collema furvuni (f), 
Leptogium plectcnchymum (g), Leptogium lacerum (h), and Leptogium 
pulchellum (i). x 1,000. 
