BOTA^■ICAL SUBJECTS. 



293 



Cyinopolia we already have an adumbration of such atrophy in 

 the sterile heads at (a.) 



Fig. 124. Cymopolia barbata (Manual of Pceleon, Xicholsoii, aud 

 Lydekker, Fig. 1,360) : (a) sterile processes, (6) fertile processes coutaiuing 

 spores. 



Similar evidence of reproductive hairs atrophying into simple 

 hairs may be obtained from Fucus serratus. 



Fig. 12S. Portion of a hair isolated from the male conceptacle of Fiicns 

 serratus with antheridia (a) (Thuret, " Et. Phyc," pi. 11). Enlarged. 



Further, Goebel, " Outlines of Classif., Sic./' p. 216, gives a 

 figure of the Sporangia of Aspidium Filix-mas. Some of the 

 Sporangia have a stalked glaml. Tliis is evidently an al)ortive 

 sporangium, although it pa-^ses as a glandular hair. It i^ inter- 

 esting to note that in this figure the sporangia, and the indusinm 

 itself, are outgrowths of the layer of epidermis, which covers the 



