(54) 



ovate-oblong, and coloured ; those next the surface very minute, and 

 arranged in vertical filamentous series. Substance membranaceous, 

 somewhat soft and fleshy, adhering but rather imperfectly to the paper. 

 Colour, a deep blood-red, passing into yellow in decay. Tubercles 

 (favellidia) slightly elevated, immersed in the substance of the frond, 

 and containing groups of minute ovate spores. Tetraspores extremely 

 minute, triparted, scattered among the radiating cells of the siu-face. 



This beautiful species is not tmfrequent on all the Ii'ish shores, mostly 

 washed on shore from deep water. On the British coasts it is much less 

 common, although it extends as far north as the Orkney Islands. 



When much torn by the waves it frequently becomes very much 

 divided in the margin, occasionally almost to the base, but otherwise the 

 frond is nearly entire, and presents more or less of a roundish or 

 reniform outline. 



EXPLANATION OF PLATE LXXXVIL 



Fig. 1. — KaUymenia reniformis, natural size. 

 2. — Portion of frond with favellidia. 

 3. — Section of same. 

 4. — Spores. 



5. — Portion of frond with tetraspores. 

 6. — Tetraspores. All magnified. 



