234 HANDBOOK OF BRITISH HEPATIC^. 



while the vegetative organs are the same type in 

 both genera. 



Acrobolbus Wilsoni, Nees. 



Stem creeping, leaves obovate-quadrate, 

 bifid, acute, lacinia, ventral, large, often uni- 

 dentate. 



Gymnanthe Wilsoni, Tayl. in Lehm. Fl. 

 Nov. VIII., p. i ; Carr. Trans. Bot. Soc. 

 Edin. VII., 452. Acrobolbus Wilsoni, Spruce 

 Hep. Amaz. p. 52. 



In scattered tufts on Radula or Frullania. 



Stems i to ^ inch long, flexuous, creeping, olive 

 or olive-brown, adhering by scattered fascicles of 

 short pale rootlets. Leaves approximate, roundish 

 or obovate, divided for a third to half their 

 length into two acute lobes, ventral somewhat 

 larger, sinus acute, margin entire, leaves inserted 

 obliquely. Fructification terminal. Involucral leaves 

 originally free, much larger than the rest, broadly 

 ovate or cordate, 2-3 lobed, with the lobes dentate. 

 After impregnation the bases of the adjacent 

 leaves are combined into an involucre, the lower 

 half of which projects below the level of the stem, 

 and forms a kind of bulb. The mouth is sur- 

 mounted by the connivent involucral leaves. Peri- 

 anth wanting. Capsule oval, dark, brown, on a stout 

 pedicel, bulbous at the base. Spores minutely 

 granular i^to'sH- Elaters bispiral. Male inflo- 

 rescence autoicous. Antheridia one or two, oval. 

 (Plate 7, fig. 83.) 



