oie 
81 
PORELLA LASVIGATA Linps. var. nov. KILLARNIENSIS. 
By W. H. Pearson. 
(Prate 477.) 
Loosery exspitose, very large, pale yellowish green above, 
ochraceous below. Stems raceful, irregularly bipinnate, on a 
cross-section 12 x 20 cells, cortical 1 or 2 layers, small, thick- 
trigones indistinct or none; acrid taste. Dimensions: Stems 
8-5 in. long, *5 mm. diam., with leaves 3 mm. ; branches 1-2 in. 
long; leaves, antical lobes 1°75 mm. X 1 mm., 1°5 mm. x ‘75 mm., 
1:5 mm. x ‘85 mm. ; postical lobes 1 mm. x°6 mm., 1 mm. X*5 mm. ; 
cells -025 mm.; stipules 1 mm.x°75 mm., ‘8 mm. x ‘6 mm., wide 
at the base. 
ab. Muckross, Stewart ¢ Holt, June, 1885. On precipitous 
rocks, Tore Wood, near the waterfall, Killarney, Ireland, W. H. 
species, it affords good material for such research, as at least four 
distinct forms can be separated, yet all belonging undoubtedly to 
the specific type. 
In June, 1905, I collected, at Killarney, a Porella which much 
interested me, and since then I have been studying the genus again, 
and venture to publish these notes. Mr. Macvicar and Mr. George 
e 
Dr. Carrington and Mr. G. A. Holt. The salient characters are the 
polished cuticle, the supposed acute antical lobes, the spinulose- 
dentate margins of the postical lobes and stipules, and a very 
peculiar character, first noticed, I believe, by the late Prof. 8. 0. 
Lindberg, viz. the acrid taste. In what is probably the type of the 
species the antical lobes are acute, with a few teeth (two or three) 
near the apex, as : y Hooker (Brit. Jung. pl. xxxv. fig. 3 
(1818) ), copied by Ekart (Syn. Jung. Germ. tab. vi. fig. 3 (1834)), 
and again by Hahn (Lebermoose Deutschlands, tab. ix. fig. 65 b 
(1885) ). Belonging to this form in Mr. Macvicar’s collection are 
specimens collected by Dr. E. Levier, Vallombrosa, September, 
1884; by F. Aug. Artoria, Prov. de Céme, Straralle prés Tarno, 
April, 1889; G. & R., . Eur. i 
Lindberg; in Mr. Stabler’s collection, specimens collected at Bar- 
mouth Junction, North Wales, May, 1888 ; and on a wall, Winder- 
mere, April, 1869, by himself; in the Manchester Museum, Crimea 
ex herb. Lindb. (K. 8009) (here the antical lobes are acute, apicu- 
Journa or Borany.—Vo. 44. [Marcu, 1906.] H 
