240 HEP AT 10 jE. 



Obs. — This is the commonest species known, being at once 

 recognised bv the presence in the antical and postical lobes of a 

 pseudo-nerve, which is often colourless, and consists of a series of 

 from 4 to 6 elongated cells, a cross-section of the leaf showing the 

 cells to be of equal diameter with others, the outer wall only 

 thickened considerably. 



Description of Plate XCYII. — Fig. 1. Plant natural size. 

 2. Stem X 24 (Nova Scotia, Macoun). 3, 4. Leaves x 16 

 (Killarney, Lindberg). 5. Portion of leaf x 290 (ditto). 6. Cross- 

 section of leaf X 85 (France, Du Buysson). 7. Bract x 24 

 (ditto). 8. Perianth x 24 (ditto). 9. Portion of mouth of 

 perianth x 85 (C. & P. Hep. Brit. Ex. n. 220). 10. Perigonial 

 stem X 60 (ditto), 11. Perigonial bract x 24 (ditto). 



2. Diplophyllum taxifolium [Wahleiib.), Dm in. 



Jungermania taxifoUa, Wahlenb. Fl. Lapp. p. 383, t. 25, f. A-C. (1812). 

 Jungermania albicans, var. taxi/olia, Nees, Nat. Eur. Leb. 1, p. 228 (1833). 

 Diplophyllum taxifolium, Dum. Recueil, p. IT) (1830). 



Dioicous ; growing in dense, depressed tufts, small to medium 

 size, of a greenish to reddish-brown colour. Stems simple or 

 ramose, sub-erect to erect, radiculose. Leaves bifarious, a little 

 distant or contiguous, conduplicate, unequally divided to below 

 the middle, margin entire or minutely denticulate, antical lobe 

 about |- to ^ the size of the postical, incumbent, patent to 

 patent-divergent, 40°-60°, oblong-oval to ovate, rotundate ; pos- 

 tical lobe spreading at right angles or slightly ascending, divergent 

 or horizontal, 80°-90°, oblong-oval to lanceolate; cells minute to 

 rather minute, subquadrate, cell-walls thick, no trigones. Bracts 

 similar to the leaves, larger Perianth terminal, obovate, upper 

 portion 5 -plicate, mouth contracted, lacinia;te-denticulate. Pistil- 

 lidia about 20. 



The male plant I have not seen. 



Fruits May, June. 



Dimensions. — Stems from J to |- inch long, diameter "3 mm. ; 

 leaves, antical lobe 1* mm. x -4 mm., postical 1*25 mm. x -5 mm., 



