421 



CRYPTOGAMIA. 



For the characters of the Natural Orders in this class, and of the Sections, see Genera. 



CXIV. CHAEACE^. 



916. CHARA. 



A. Tube of Stem and Branches surrounded 

 hy smaller tubes. Whorled Branches sim- 

 ple, bearing the fruit. 



i. Anthers or Globules on a different plant. 



Sp. 1-3. 

 ii. Anthers placed below the fruit on the 



same plant. Sp. 4-6. 



B. Tube of Stem smTounded by spiral tubes ; 

 that of Branches without them. Sp. 7- 



C. No surrounding tubes. 



i. Anthers placed below the fruit. Sp. 8. 

 ii. Anthers by the side of the fruit. Sp. 9. 

 iii. Anthers placed above the fr'uit. 



a. Whorled Branches not trifid nor di- 

 chotomous. Sp. 10, 11. 



b. Whorled Branches more or less di- 

 chotomous. lYuit at the forks, clus- 

 tered. Sp. 12-14. 



c. "Whorled Branches dichotomous. 

 Flowers soKtary. Sp. 15-18. 



iv. Anthers on a different plant. Sp. 19. 



A. 'Jhibe of Stem and Brandies surrounded 

 by smaller, generally spiral, tubes. Whorled 

 Branches simple, bearing the fruit. 



i. Anthers or Globules on a different plant. 



1. ci-inita. "Stem thickly clothed with 

 clustered, slender, very acute prickles. Two 

 very acute Bracts at base of fruit. Crown of 

 Fruit very short, broad, erect. Halle in Sax." 

 — Beaun. 



2. asperia. Stem clothed in its upper part 

 with long, slender, detached strigse. Bracts 

 4-6, exceeding the fruit. 5-8. Stagnant 

 water, occ. I find whorls of spines on the 

 barren branches. 



3. ceratophylla. " Prickles of the vStem 

 very short. Plant larger a!nd thicker than 



Bracts exceeding the fruit. 



C. vulgaris. Berlin. Seaphusia." — Beaun. 

 " Stems branched, corky, very rigid, twisted. 

 Pricldes conical, cuspidate, papilliform. Ra- 

 muli about 6 in a whorl, jointed, widely spread- 

 ing ; upper shorter, incurved, coloured. IBracts 

 whorled, spreading, ovate, about equalling the 

 globi:de and fruit. Brackish pools near Wans- 

 leben. The largest of the genus." — Walle. 



ii. Anthers placed beloio the fruit. 



4. vulgaris. Prickles on the Stem 0, or 

 few and scattered. 

 5-8. Bitches and pools. 



5 . hispida. Prickles on the Stem nume- 

 rous, more or less clustered. Bracts exceeding 

 the fruit. 6-8. Ponds and still water. 



6. fragilis. Stem without prickles. Bracts 

 falling short of fruit. 5-8. Stagnant. 



S. Stem surrounded by spiral tubes. Whorled 

 Branches without them. 



7. scoparia. " Seed crowned with a very 

 acute papiUa. Berlin." — Beaun. 



C. Ko surrounding ttibes. 

 i. Aiithers placed below the fruit. 



8. coronata, Gay fro^n A. Beaun. I 

 have no further description of this. 



ii. Anthers on each side of fruit. 



9. barbata, Gkxfrom A. Beaun. I have 

 no further description. 



iii. Anthers placed above the fruit. 

 a. Whorled Branches not di-trichotomous. 



10. translucens. Branches simple, ob- 

 tuse. Flowering-branches short, much divided, 

 with clusters of fruit surmounted by an anther 

 and 3 points or very short bracts. Sandy 

 pools, rare. 



11. gloiuerata. Whorled Branches fur- 

 nished with w'horls of secondary branches or 

 bracts. Fr. clustered. 6-8. Stagnant. Bondy. 

 Said to be C. nidifica of Eng. Bot. 



