that wlth his younger eyes D/ Schmitz might bave bccn ablc to scc 

 the structure bctler. In this case I thcrcforc adoplcd the opinion of 

 the latter. 



1 now take the criticisms of D.' Schmitz serìalim and will makc 

 such explanatory remarks as seem necessary. It is however due to 

 myself to state that I bave not had the opportunity of examining 

 D.'" F. Schmitz own specimens, except a sterile fragmcnt of Myrìo- 

 glossa Beckeriana. 



1. Corallopsis aculeata. D/ Schmitz rightly points out that the 

 referencc of Gelidium acuUatuni, Krauss, to the genus Corallopsis was 

 due to D/ J. G. Agardh, but he does not give me credit for detecting 

 the cystocarps, which proved the correctness of Agardh's suggestion, 

 but which the latter had not seen (Analecta Alg. p. 126.). 



2. Ptilota cryptocarpa. D/ F. Schmitz expresses astonishment that 

 having accepted his subdivisions of Pliloia info different genera, in 

 the «Revised List of British Marine Algaì» I hould stili place this 

 new species in Ptilota. As a matter of fact^ only the Chlorophycecc 

 and Ph(£opìiyce(E in that List were arranged by me, the Rhodophyceo'- 

 and CyanophycecB were classifìed by my friend and collcaguc M/ 

 E. A, L. Batters, who followed Schmitz"s classification throughout as 

 being the most recent published. 



I bave defìnitely stated my opinion in the « Annals of I3otany » 

 that I consider Ptilota cryptocarpa to form a link between the genera 

 Ptilota and Dasyphila, and that personally I should prefer to see the 

 whole form one genus with different sections, my plant belonging 

 therefore to the section which Schmitz would erect info the genus 

 Psilothalia, (« Kleinere Beitràge » VI. p. (ì) and including also P. 

 striala, Ilarv. and P. siliculosa, Ilarv, 



In one point I think D/ Schmitz is in error. Ile accuses me of 

 inaccurate observation, and remarks that the callithamnioid filamcnts 

 fall off early. I bave carefully reexamined the plant and find that in the 

 sterile branches these tìlaments are present only on the extrcme api- 

 cai pinnules, and that there is no trace of their falling off, for therc 

 are no broken filaments visible, but rather it appears that like the 

 terminal filaments in Polysiphonia, they unite to form the surface 

 of the frond, remaining free only around the fertile apices. The cysto- 

 carps are not invariably terminal, for I bave seen the pinnule prolonged 

 beyond them so that then, as in other species of Ptilota, thcy project 

 on the upper surface of the pinnule near its apex. 



3. Glaphyrymenia porphyroidea, Schmitz Ms. The frond has a 



