PLATE IX. 



( 'hlorodesmis. 



Usmis Hildebrandtii. Portion of fig. ;?<i 40, w»th tw " ascending filaments marked /. 

 1 : are on plate VIII]. 



Avrainvillea. 



jj. Avrainvillea Rawsom Howe. Filaments of thallus in fig. 76 ioü. In this species the filaments 

 are thin-walled, mostly torulose and pallid. 

 I -s. Avrainvillea nigricans Decaisne. Habit of type plant, nat. size. (Guadeloupe, D'Avrainville, in 

 Herb. Mus. Paris). This species usually attains inuch larger dimensions. 

 . Frond-filaments of same plant 100. They are distinctly moniliform. 

 Fig. 80. Ditto. Frond-filaments of another plant 100 (St. Thomas, West Indies. " Challenger" Expedition 

 81 "ii plate X. 



in Herb. Mus. Brit.). 1'lu- ultimate ramuli are divaricate and taper to their apices. 



Fig. 82. Avrainvillea Mazei Murray and B Ile. Frond-filaments of plant shown in fig. 81 in plate X. 100. 



They are cvlindrical, not beaded, not tapering, are strongly constricted above dichotomy and 

 often are deep orange-brown in colour. 

 Fig. 83. Ditto. Frond-filaments >nd type plant 100 (Guadeloupe, Mazé, n". 1234 in Herb. 



Mus. Bril 

 84. Avrainvillea erecta nov. comb. Habit of plant. nat. size. (Philippines, Cuming, n". 2234 in Herb. 

 is. Brit., hem- part of CüMlNG's original gathering). 

 Ditto. Frond-filaments of type plant [Dichonema erectum Berk.) 100 (Philippines, Cuming 



n". 2234 in Herb. Keu . [n A. erecta the filaments are cylindric, not tapering, are strongly 

 constricted above dichotomy, and are yellow to intensely fulvous. 



