109 



B. 



subsp. subpapillata (p. i i 2). 



4. U. conglutinata (p. 1 14). 



6. U. oriënt alis (p. 119). 



7. U. explanata (p. 120). 



|3. Filaments of frond bearing numerous, more or less ob- 

 vious, distichous papillae. 



1. Filaments 30 — 45 u. in diam. ; beset with evident 

 papillae from base to apex. Length of papillae equals 

 diameter of filament 2. U. papillosa (p. nf 



2. Filaments 30 — 55 u. in diam., fibuliferous at base of 

 frond, bearing low, inconspicuous papillae above . 



b. Frond distromatic to pluriseriate. 



a. Frond filaments without lateral appendages. 



* Frond flabellate. Cortex of stipes running up on to base 

 of frond. 



a. Filaments 25 — 50 a in diameter. 



1 . Constrictions of frond-filaments quite or almost 

 equidistant above dichotomy. Filaments 25 — 70 y. 

 in diameter. (Western hemisphere) 



2. Constrictions of frond-filaments at markedly une- 

 qual distances above dichotomy. Filaments of 

 frond 25 — 35 ij. in diameter. (Eastern hemisphere). 



b. Filaments 50 — 65 u. in diameter. Supra-dichotomial 

 constrictions even. (Eastern hemisphere) .... 



** Frond cyathiform. Filaments 35 — ioou in diameter. 

 Cortex of stipes ending abruptly, not running up on to 



frond 5. U. cyathiformis (p. 117) 



|3. Frond-filaments with lateral appendages, unilaterally but 

 interruptedly arranged (i. e. alternately unilateral). 



* Appendages simple, truncate or subpeltate. .... 

 ** Appendages simple or 2 — 3-fid, acute, usually sessile. 



1. Supra-dichotomial constrictions uneven. Main fila- 

 ments about 30 ij. in diameter. (Indian Ocean) . 



2. Supra-dichotomial constrictions even. (West Indies). 



Filaments 45 — 70 [j. in diameter . . U. spimdosa var. palmettoidea (p. 125). 



*** Appendages 2 — 8-pronged, stalked. (West Indies). 

 Main filaments 46 — 84 u. in diameter, supra-dichotomial 



constrictions even 10. U. spimdosa (p. 124). 



Main filaments not visible in surface view, being concealed by 

 a close cortex composed of numerous branchlets, simple or 

 subdivided, contiguous. Frond not, or rarely, fissile. 

 a. Main filaments distromatic to pluriseriate. Cortex easily 

 separable after decalcification. Lateral appendages short, of 

 approximately equal length, very numerous. 



8. U. indica (p. 121). 



9. U. palmetta (p. 122). 



