LEPTOGIUM. 159 



mic. Schcer. Enum. p. 250. G. scotinum, Ach. Meth. p. 237; 



Syn. p. 323. 



Only known here in 



ll(b). Z. Cafa/ormcww, Tuckerm. ; a rather larger lichen, be- 

 coming blackish-brown ; the irregular lobes either dilated and 

 much elongated, with regularly crenate edges, finely and sharply 

 wrinkled, and at length granulate (f. platynum] or much nar- 

 rowed and aggregated and becoming sub-fimbriate, or finally 

 pulvinate, dark-brown, and the densely crowded, erect, sub- 

 linear lobes with granulate -dentate tips (f. lophotum) ; apothecia 

 small to middling, but according generally, as do the spores,, 

 with those of n. 12. L. scotinum, var. Tuckerm. Gen. p. 96. 



Kocks, California (Bolander; Mann], Tuckerman Gen. 1872. 

 Some of the intermediate states between the two named 

 forms of the Californian plant do not differ from European ones 

 of L. sinuatum (L. scotinum, Auct.), and the lichen seems to be 

 scarcely referable, in any condition, to L. lacerum, which is un- 

 known as yet on the West Coast. The whole aspect of the- 

 f. platynum (the lobes of which exceed at length an inch in 

 length) is rather that of Collema granosum (as in Hepp. n. 648). 

 The pulvinate f. lophotum, offering densely crowded, narrow 

 linear, erect branches, the summits of which constitute a longish 

 fringe, is clearly analogous to, though perhaps more regular than r 

 L. lacerum v. lophceum of some (Anz. Langob. n. 412, hardly to 

 be removed from L. lacerum), which variety Acharius always 

 took for a form of his Collema scotinum. 



12. L. palmatum (Huds.) Mont.; thallus middling - sized, 

 caBSpitose, irregularly laciniate, sharply more or less wrinkled 

 and pitted; from lead-coloured rufescent and finally chestnut; 

 the divisions convolute and at length much narrowed and tubu- 

 lose-fruticulose, with 2-3-4-corniculate, obtuse tips; apothecia 

 small, biatorine, sessile, a little concave ; the disk red-brown, 

 the paler margin entire. Spores ovoid- ellipsoid, muriform-mul- 

 tilocular (the transverse series of spore-cells 6-10), decolorate, 



X*^? mic. Mudd. Man. Brit. lAch. p. 48. Collema cornicula- 



tum (Hoffm.}, Sclicer. Enum. p. 249. Leptogium palmatum & 

 Obryzum corniculatum (fungo parasit. excluso), Nyl. Syn. pp. 

 126, 136. 



On the earth among mosses, California (Menzies j Bolander) 



