1058 HEPATJCiE COLLECTED BY MR. T. WHITELEGGE IN N. S. WALES, 



DESCPJPTION OF PLATE XXXV. 



Fig. 1. Plants nat. size. 2. Plant enlarged. 3-6. Cross-sections x 16. 7. 

 spores X 85. 



49 EicciA BULLOSA, Link. var. vesiculosa. 



Fronds obovate, bilobed, pale silvery green, lobes linear or 

 cuneate, obtuse, emarginate, obsoletely canaliculate, section trigon- 

 ous, upper half cavernous, lioney-combed, epidermic layer thin, 

 composed of much smaller cells, rugose, and in the old fronds 

 pitted. 



Plants forming whitish patches. Fronds 3-4 lines long by 1-2 

 broad, fleshy, bluntly trigonous on section, bifurcate, segments 

 linear, transversely sulcate, narrowly canaliculate, margin rounded 

 and waved, epidermic layer cavernous, looking under the micro- 

 scope like the closed cells of a honey-comb. 



On section the upper half of the frond is found to be composed 

 of prismatic air-cells invested with delicate cellular walls. 



Beneath this there is a compact green layer of smaller cells 

 invested by the outer walls of the frond from which numerous 

 rootlets are given off. Sides and undersurface greenish. 



Measurements. — Plant 4 to 7 mm. long; lobes 1-75 mm. to 

 2-5 mm. broad, 1-25 mm. thick ; sinus -25 mm. deep. 



Jjah. — On earth, Parramatta, August, 1885. 



Ohs. — This beautiful species comes very near R. bullosa, Link. 

 But the enlarged section in Lindenb. Monog. Ricciae, Tab. XXIII., 

 f. 6, shews a constriction between the vesicular and chlorophyllose 

 parts of the frond. 



If further enquiry proves this Australian species to be distinct 

 from E. bullosa, we propose the name Riccia vesiculosa for it. 



