COLLEMA. 



285 



cross rows, and sometimes appear divided also into two ver- 

 tical series. Moniliform filaments, of w r hich the bulk of the 

 thallus is composed, are here easily studied. 



Phallus foliaceous, when dry coriaceous-cartilagi- 

 nous, when nioist joulpose-gelatinous ; apothecia scutel- 

 late, rarely patellate. 



8. Collema plicatile {plica, a fold or plait). Thallus 

 blackish-green, laciniate, orbicular, lacinise undulate-plicate, 

 — centre imbricate-lobate. Apothecia superficial, sessile, red- 

 dish. (E. B. 2348.) 



On rocks in some parts of the Highlands. 



The genus Lichina is classed by some Lichenologists 

 among the Collemacem. We allude to it here merely for 

 the purpose of claiming, as a true Lichen, a genus which has 

 long been a truant among the ranks of the Algse. As a sea- 

 weed it has been described in a companion volume (Dr. 

 Landsborough's ' Popular History of British Seaweeds/ 2nd 

 edition, p. 100). I shall therefore only point out a few of 

 its structural characters, which justify its separation from 

 the Algse and reception among the Lichens. The two 

 British species. Z. pygmcEa and L. confinis are more or less 

 common on all our seaside rocks. Landsborough confesses 

 frankly " these two little plants are introduced as interlo- 



