PIPEBAGEJ^J. 



479 



Ascarina, 1 finally, may be described as intermediate between Chlor- 

 anthus and Hedyosmum. Of the former genus it has altogether the 

 habit, leaves, inflorescence, ovary, and fruit. But its broad stigma 

 is sessile ; the gynseceum is axillary to a bract, accompanied by two 

 sterile bractlets ; and the unisexual flowers are dioecious. The male 

 spikes consist of monandrous flowers as in Hedyosmum, with each 

 stamen axillary to a bract. The two-celled anther tapers to the 

 apex, and opens by two sublateral longitudinal clefts. The two or 

 three species of Ascarina 2 inhabit the islands of Oceania. 



IV. ? HOENWOET SEEIES. 



The Hornworts 3 (Fr., Cornifle ; figs. 526-532) have monoecious 



Ceratophyllum vulgare (demersum). 



Fig. 527. 

 Male flower (f ) 



Fig. 528. 

 Fruit (f). 



Fig. 526. 

 Flowering branch. 



Fig. 529. 



Long. sect, of 

 fruit (f). 



Fig. 530. 

 Embryo (f ). 



unisexual flowers. The males have a short convex receptacle, bear- 



1 Foest., Char. Gen., 59. — J., Gen., 482. — Seem., in Bonplandia (1861), 251; Fl. Tit., 258, 

 Eitdl., Gen., n. 1818. — C. J. de Coedem., in t. 74. 



Adansonia, iii. 301. — De Solms, Prodr., 477. 3 Ceratophyllum L., Gen., n. 1055. J., Gen., 



2 W., Spec, iv. 647. — Spbeng., Syst., i. 19.— 18. — Gjsetn., Fruct., i. 211, t. 44.— Lame.] 

 Hook, f., in Journ. Linn. £oc, i. 127, 129.— Diet., ii. 113 ; III., t. 775.— Schkuhb, Handb'., 



