454 INTRODUCTION TO CRYPTOGAMIC BOTANY. 



8. JuBULE^, Nees., Endl. 



Valves of sporangium reaching only to the centre ; elaters 

 unispiral ; perianth regular, divided above ; involucre of a 

 different shape from the leaves ; leaves lobed or folded below. 



498. The last tribe has brought us by gentle degrees to the 

 vast mass of leafy Jungermanniw. The tribes hitherto have 

 contained but few species : a single genus alone in the present, 

 Frullcmia, contains considerably more than a hundred, while 

 Lejeunia has twice that number. Far the greater part of 

 the species belong to the tropics, or to those temperate regions 

 which display tropical forms. Lejeunia and Frullania toge- 

 ther have scarcely more than a dozen European representa- 

 tives ; of these Lejeunia serpyllifolia and Frullania tama- 

 risci, especially the latter, are almost universally distributed. 

 Frullania has sixteen species in New Zealand, whde Lejeunia 

 has seventeen. The perianth is mostly ribbed or angular, with 

 the angles frequently ciliated, sometimes merely compressed. 

 The leaves have always a lobe at the base, variously convolute, 

 saccate, &c. ; and sometimes, as in Frullania, between the sac 

 and the stalk there is a style-shaped process or triangular fold, 

 an exaggeration of which appears in F. cornigera (Fig. 95, i). 

 The cells of the inner wall of the sporangium do not contain 

 any annular fibres, and the peduncle is often nodular when 

 dry, from the contraction of the body of the prismatic cells of 

 which they are composed. All the genera, except Frullania, 

 have but a single archegonium. In Frullania there are from 

 two to four. Fhragmico7na, which is represented in Ireland 

 by P. Mackaii, is distinguished from Lejeunia by its com- 

 pressed perianth. Lejeunia differs from Frullania in its 

 single archegonium, its connivent valves, and in the less com- 

 plicated leaves. Mitten is inclined to unite most of the other 

 genera with Frullania, and I think rightly. Bryopteris is 

 remarkable for its superior size to most Frullanice and hyp- 

 noid aspect. 



9. Platyphyll.^, Nees. 



Perianth campanulate or subcylindrical, not winged or 

 angular, more or less depressed, bilabiate ; involucre of the 

 same shape as the leaves ; archegonia numerous ; sporangium 



