“…More than 200 paraffin blocks of preserved specimens produced over 1,000 slides from which measurements and more than 200 micro-images were obtained; 30 SEM mounts were made that produced more than 250 images. For cell dimensions and other characters, the numbers of stations/plants/ filaments measured (i.e., for each data point) are as follows: Phymatolithon rugulosum, 25/41/52; P. laevigatum, 33/44/47; quantifiable, and statistically significant patterns of anatomy were identified; included was a newly described intercalary meristem (an uncommon feature in red algae) underlying the superficial morphology (Adey, 1964(Adey, , 1965Adey et al, , 2005Adey et al, , 2013Adey et al, , 2015a. The evolution of the diverse anatomy in these genera was hypothesized, in large measure, to be a defense against mollusk grazing (Steneck, 1982(Steneck, , 1992; different genera and species showed a wide variety of anatomical strategies to counter that grazing.…”