XXIV SYNOPSIS OF THE SPECIES. 



158. farinosa; minute, irregular in outline, rather thin, pallid, with 2-3 promi- 

 nent ceramidia. (Tab. CCCXLVII. B.) 



159. verrucata; thin, expanded, irregularly lobed, pallid, dotted over with 

 minute, pimply ceramidia. (Tab. CCCXLVII. C.) 



160. pustulata; thick, dull purple or green, oblong, incrusting; ceramidia 

 numerous, large, prominent, conical. (Tab. CCCXLVII. D.) 



XLIX. HILDENBRANDTIA. 



161. rubra. (Tab. CCL.) 



L. HAPALIDIUM. 



162. Phyllactidium, Kiitz.; flabelliform, variously lobed, colourless. (Litho- 

 cystis Allmanni, Tab. CLXVI.) 



Common on Algae round the British coasts ; and, according to Kiitzing, 

 found abundantly in the Mediterranean and in New Holland. Our figure 

 represents the young plant, which afterwards becomes much more lobed 

 and expanded. 



. Order 10. DELESSERIACE^. 



LI. DELE&SERIA. 



163. sanguineaj stem short, cartilaginous, bearing oblong, transversely veined, 

 entire, undulate leaves; veinlets opposite. (Tab. CLI.) 



164. sinuosaj stem branched, bearing oblong or ovate, deeply sinuate or pin- 

 natifid, toothed, pennate-ribbed leaves; nerves opposite. (Tab. CCLIX.) 



165. alataj stem dichotomous, decompoundly branched, winged throughout 

 with a narrow, membranous, pennate-nerved lamina. (Tab. CCXLVII.) 



166. angustissima; frond very narrow, compressed, two-edged, distichously 

 much branched, destitute of membrane. (Tab. LXXXIII.) 



167. Hypoglossum j frond linear-lanceolate, repeatedly proliferous from the 

 midrib with leaflets of similar form; leaflets acute. (Tab. II.) 



168. ruscifoliaj frond linear-oblong, repeatedly proliferous from the midrib with 

 leaflets of similar form ; leaflets round at the apex. (Tab. XXVI.) 



III. NITOPHYLLTJM. 



160. punctatumj frond very thin and delicate, nerveless, more or less regularly 

 dichotomous, rose-red ; axils rounded ; sori large, oblong, scattered over the 

 whole surface. (Tab. CCIL and CCIII.) 



170. Hillisej frond thickish, veiny toward the base, roundish, irregularly cleft; 

 segments oblong, obtuse ; sori very minute, dot-like, densely scattered over 

 the surface of the frond. (Tab. CLXIX.) 



171. Bonnemaisoni; frond shortly stalked, fan-shaped, variously cleft; seg- 

 ments wedge-shaped ; spots of granules minute, roundish, scattered over the 

 surface. (Tab. XXIII.) 



172. Gmelinij frond crisp, stipitate, veined at the base, lan-shaped, vaguely 

 cleft ; segments broadly wedge-shaped, waved, and curled ; sori linear, 

 marginal. (Tab. CCXXXV.) 



17;3. laceratumj frond subsessile, rigidly membranous, traversed by branching 

 veinlets, dichotomous; segments linear or cuncate, waved at the margin, 

 obtuse; sori oblong, marginal. (Tab. OCLXVU.) 



