HEPATIC/E. (liverworts.) 683 



14. ANEURA Frond without a midrib, bearing the fruit underneath near the margin. 



15. STEETZIA. Frond with a midrib, bearing the fruit on its upper side. 



16. PELLIA. Frond without a definite midrib. Fruit dorsal. 



17. BLASIA. Frond with a midrib, bearing the fruit near its apex. 



II. Vegetation foliaceous (leaves and stem distinct). 



♦ Leaves succubous, i e. the apex of each leaf lying under the base of the succeeding leaf. 

 +- Amphigastria present (except in No. 18). 



18. FOSSOMBRONIA. Perianth campanulate ; its mouth wide, undulate. 



19. GEOCALYX. Perianth none : involucre flesh}', becoming subterranean. 

 20 CHILOSCYPHUS. Perianth obovate, 2 3 lobed Calyptra chartaceous. 



21. PLEURANTHE. Perianth fusiform, concrete with the calyptra. 



22. LOPIIOCOLEA. Perianth 3-lobed, triangular ; the lobes crest-toothed. 



23. SPHAGNtECETIS. Perianth triangular at the apex ; its mouth denticulate. 



24. JUNGERMANNIA. Perianth tubular ; its mouth contracted, denticulate. 



+- +- Amphigastria absent 



25. SCAPAN1A Perianth compressed parallel to the stem truncate Leaves 2-lobed. 



26. PLAGIOCHILA Perianth compressed contrary to the stem. Leaves not 2-lobed. 



27. SARCOSCYPHUS. Perianth and involucre united Leaves 2-lobed. 



28. GYMNOMITRIUM. Perianth wanting. Leaves 2-lobed. 



» * Leaves incubous, i. e. the apex of each leaf lying on the base of the succeeding leaf Am- 

 phigastria present (except in No. 32). 



-<- Leaves complicate -2-lobed. 



29. FRULLANIA. Perianth keeled beneath. Lower lobe of the leaf auriculiform. 



30. LEJEUNIA. Perianth terete or angular Lower lobe of the leaf plane. 



31. MADOTHECA. Perianth compressed, 2-lipped 



32. RADULA. Perianth compressed. Amphigastria absent. 



33 PTILIDIUM. Perianth terete. Leaves and amphigastria ciliate. 



+- +- Leaves not complicate - 2-lobed 



34 SENDTNERA. Perianth 3- or 6-angular ; its mouth many-cleft. Leaves 5 - 6-cleft. 



35. TRICHOCOLEA. Perianth none. Leaves capillary-many-cleft 



36. MASTIGOBRYUM. Perianth triangular Stems flagelliferous. 



37. LEPIDOZIA. Perianth 3-plaited ; its mouth denticulate 



38. CALYPOGEIA. Perianth none. Involucre fleshy, subterranean. 



Suborder I. RICCIACE^. 



Terrestrial or aquatic, frondose little annuals, with the fruit immersed in 

 the frond, or sessile upon it. No perianth nor elaters. Capsule sessile, 

 bursting irregularly. 



1. RICCIA, Midi. Floating Livekwokt. (Tab. 20.) 



Fruit immersed in the frond. Involucre none. Calyptra coherent with the 

 globose capsule, and crowned with the persistent style. Spores angular. Inflo- 

 rescence monoecious or dioecious : antheridia imbedded in the frond. (Named 

 after Ricci, an Italian botanist. ) 



* Frond without air-cavities : terrestrial. 

 1. B. glaiica., L. Frond somewhat stellate-lobed ; its divisions liuear- 

 obovate, emarginate-lobed, channelled, dotted, glaucous, membranaceous along 

 the margin. — On moist ground. (Eu. ) 



