158 THE JOURNAL OF BOTANY 



scattered over the district between Loch Etchachan and Loch 

 Avon. 



Chandonanthus setiformis (Ehrh.) Lindb. 89. Eocks near the 

 Post Office, Glenshee, sparingly with the var. alpinus. — Var. 

 alpinus (Hook.) Kaal. 92. Creag Choinnich, sparingly; Morrone 

 Hill and Cairn Taggart, fairly common. — Var. nemoides Kaal. 

 92. Eocks above Kander, sparingly, but well-marked. A form 

 closely approaching this variety also occurred in Glen Beag near 

 the Cairnwell, but it is perhaps better referred to a depauperate 

 form of the var. alpinus, though there is no sharp line of demar- 

 cation between the two varieties. 



DiplophyUum taxifolium (Wahl.) Dum. 90. Canlochan. 92. 

 Ben Muich Dhui among rocks at about 3700 ft., well characterized. 

 — D. obtusifolium (Hook.) Dum. 89. Moist micaceous earth, 

 Glen Beag, c. per. 



DiplophyUum gymnostomophilum Kaal. in Beitrage zur Leber- 

 moosflora Norwegens von B. Kaalaas, Christiania, 1898, p. 4. 

 Scapania gymnostomopliila Kaal. in Bot. Notiser, 1896, p. 21. 

 (Plate 526, figs. 1-6.) Dioicous, male and female plants in 

 separate tufts, in growth and appearance very like a small 

 Scapania, growing scattered or in small tufts between mosses or 

 creeping over them, most often over tufts of Gymnostomum rupestre 

 and G. curvirostre, rarely in small flat growths directly on the 

 ground, dark green, colourless below to 2 cm. long and to 2 mm. 

 broad with the leaves. Stem simple, rarely branched, brown, in 

 the younger parts yellowish, creeping with erect apices, compara- 

 tively thick and rigid, very brittle when dry, sinuose, thickly 

 clothed with long hyaline root-hairs on the under side ; transverse 

 section oval, rather more strongly arched on the ventral side, 

 antico-postical diameter 0-42 mm. diameter in breadth 0-25 mm. ; 

 cortical cells in 2-3 layers, strongly thickened and brownish, 

 about 14 fx, the rest thin-walled to 20 /x. Leaves in two rows, 

 approximate or touching one another, rarely overlapping, of equal 

 size throughout, squarrose or slightly decurved, occasionally 

 slightly antically secund, strongly arched on the back when dry, 

 so that the plants are convex on the under side, rather thick and 

 rigid, semi-amplexicaul, divided to ^ to f into two unequal con- 

 duplicate lobes ; commissure curved or nearly straight ; postical 

 lobes obliquely oval to elongate-reniform with strongly rounded 

 lower margin, scarcely decurrent, obtuse or more or less pointed 

 and erose where gemmae have been formed ; antical lobes only 

 one-third to one-fifth as large, reaching to about the middle of the 

 stem, obliquely oval to ovate-lanceolate, acute, rarely obtuse, 

 rarely with the apex recurved ; margins of both lobes entire. 

 Leaf-cells obscure and opaque, irregularly 4- to 6-sided, often 

 arranged in distinct longitudinal rows, of about equal size, 

 17-23 \i, closely packed with chlorophyll and oil-bodies, cells on 

 the lower margin of the postical lobes in 1-7 rows, empty and 

 transparent ; marginal cells smaller, quadratic 12 /x ; cell- walls 

 moderately thickened all round. Cuticle smooth or slightly 

 papillose. Perianth terminal or apparently lateral owing to 



