12G THE JOURNAL OF BOTANY 



character of G. inflate var. heterostipa are not present in the 

 Welsh plant to the same extent, as compared with the lateral 

 branches. The latter, as a rule, have a " stutzblatt " or one-lobed, 

 widely lanceolate, rarely bilobate leaf, at their base. The lobes of 

 the leaves in our plant agree with G. acutiloba in being acute, 

 whereas in G. in data var. heterostipa they are obtuse. The leaves 

 are also more erect and turned forwards. It differs only from the 

 original in having the leaves more distantly placed on the stem, 

 on account of which Kaalaas suggests the name acutiloba forma laxa. 



The following is a translation of Kaalaas' original description, 

 slightly modified : — 



11 Only sterile plants known. In complete tufts ; brownish 

 green when dry, brown to blackish brown, 1-1*5 cm. long ; in 

 habit somewhat like small forms of Jungermannia inflata or Cesia 

 revoluta. Plants divided in a forked manner with specially 

 shaped ' stutzblatt,' but also here and there having postical 

 branches. Stem yellow or brownish green, little curved, creeping 

 throughout its whole length by hyaline or brownish, fairly short 

 radicles, about 0-14 mm. in diameter, composed of short rect- 

 angular cells, of which there are about twenty at the periphery. 

 Leaves fairly distant, hardly touching each other, attached trans- 

 versely or a little diagonally, not decurrent, erect or nearly so and, 

 as a rule, slightly curved towards the postical side of the stem, 

 0-1 mm. long and 03-04 mm. wide, oval quadrate to inversely 

 egg-shaped, with a distinctly narrowed base, somewhat concave, 

 divided for $-f into two lobes by a narrow, sharp, or rounded 

 sinus ; lobes narrowly egg-shaped to widely lanceolate or tri- 

 angular, usually acute, more rarely somewhat obtuse, with in- 

 curved points, the ventral lobes most frequently somewhat larger, 

 the dorsal edge (more rarely also the ventral edge) of the leaf 

 having a blunt tooth at one corner. Occasionally three-lobed 

 leaves are met with. Leaf-cells everywhere uniform in size, 

 elongated and rounded, polygonal, 0-20-0-028 mm. long and 0-020- 

 0-033 mm. wide, in the younger leaves filled with oval or rounded 

 chloroplasts, cell-walls throughout, particularly at the angles, 

 strongly thickened, without, however, any distinct trigones. 

 Under-leaves usually absent, only evident here and there on inno- 

 vations, small, subulate, and curved inwards." 



Synonymy : — 

 Gymnocolea acutiloba K. Mull. Lebermoose, i. 745 (1910); 

 Macvicar, Brit. Hepat. 158 (1912). 



Jungermannia acutiloba Kaal. in Nyt. Mag. f. Nat. xl. 250 (1912). 



Lophozia acutiloba Schiffn. in Hedwigia, xlviii. 187 (1909). 



Pleuroclada acutiloba Steph. in Bot. Centralbl. ex. 317 (1909). 



Distribution.— Grodener Tal, South Tyrol, on schistose detritus 

 (Schiffner, 1899). Gross Alrtal, Salzburg, in copper mines 

 mgartner, 1908). Kavines near Eseli, in the Trapezant 

 District. Asia Minor, on cuprous tufa (Handel-Mazzetti, 1903). 

 Nesheimshorgen, in Granvin, Hardanger, Western Norway (Haraas, 

 1898) ; original. Rhinog Fawr and Bwlch Tyddiad above Cwm 

 Bychan, near Harlech, North Wales, on sandstone grit. 



