82 
ORGANIC DEPENDENCE AND DISEASE 
living plant borers were chiefly green and blue-green algae, 
only two of their species being recognized as having a prob- 
able affinity with the fungi. In a very instructive paper by 
Duerden 1 on the effect of these algae in the disintegration 
of recent corals, it is remarked that the red algae also have 
now been recognized among these borers. 
Fig. 67. Boring Plants (recent). a. Siphonocladus voluticola Hariot. x 80. 
1). Gonontia? x 250. c. Gonontia polyrhiza Bornet and Flaliaut. x 250. 
d. Mastigocoleus testarum. x 330. (After Bornet and Flahaut, op. cit . ) 
That the debris of the Paleozoic beaches and the shallow 
grounds of the sea, the living as well as the dead shells, 
were abundantly attacked by these microscopic plant para- 
i Bui. Amer. Mus. Nat. Hist., v. 3 6, p. 323, pi. 32. 1902. 
