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. Siphonochidus roluticola Hariot. x 80. 



1). Gonontiat x 250. c. Gonontia polyrlriza Bornet and Flahaut. x 250. 



d. Maxtigocoleus 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- 



iBul. Amer. Mus. Nat. Hist., v. 16, p. 323, pi. 32. 1902. 



