INVERTEERATA, CRYPTOGAMIA, MICROSCOPY, ETC. 831 



3. Species of Japan and Tropical Asia : — 



38. I. japonica A. Br. 39. I. coromandeliana Linn. 40. I. hrachj- 

 glossa A. Br. 



4. Species of Australia : — 



41. I. tripus A. Br. 



5. Species of Tropical America : — 



42. I. amazonica A. Br. 43. I. cuhana Engelm. 44, I. Gardneriana 



Kunze. 



IV. Terrestres. 

 45. I. Duriaei Bory. 4G. I. Hystrix Bory. 



Of these 46 species, the 3 following are new : I. Schweinfurtlm 

 A. Br. ms. Eootstock 3-lobed. Habit of I. setacea. Leaves 

 12-30, about a foot long, moderately firm in texture, opaque, tapering 

 to the point, \-\ lin, diam. at the middle, furnished with stomata 

 and accessory bast-bundles. Sporange small, globose ; veil none. 

 Macrospores small, chalk-white, with high ridges and strongly honey- 

 combed all over. Central Africa. I. amazonica A. Br. ms. Eootstock 

 3-lobed. Leaves 10-20, 2-3 inches long, i-J lin. diam. at the middle, 

 firm in texture, furnished with stomata and accessory bast-bundles, 

 with a membranous border, about \ inch long, decurrent from the 

 dilated base. Sporange small, white, globose, much spotted ; veil 

 rudimentary. Macrospores middle-sized, chalk-white, closely strongly 

 tubercled, I. cuhana Engelm. ms. Eootstock 3-lobed. Leaves 

 10-50, ^-1 foot long, \ lin. diam. at the middle, opaque, moderately 

 firm in texture, furnished with stomata and accessory bast-bundles, 

 the membranous base suddenly dilated. Sporange small, oblong, 

 unspotted ; veil very narrow. Macrospores small, strongly tubercled. 

 Microspores papillose. Cuba. 



Muscineae. 



Structure of Dumortiera.* — With the exception of the Eielleae, 

 Dumortiera is described as the only genus of true Marchantiaccfe 

 which wants the usual layer of air-chambers with the stomata, as 

 well as the ventral scales. H. Leitgeb has subjected the genus to 

 close examination with a view of confirming or otherwise this state- 

 ment, the species specially examined being D. irrigua and Jiirsuta. 



His conclusion is that at least these two species exhibit a complete 

 uniformity with the normal Marchantiacejc, at all events in an early 

 stage, in the possession of a layer of air-chambers and of stomata, in 

 tlie formation of the veutral scales, and in jiossessing both kinds of 

 rhizoids, the unthickcned and the conical. The only difference con- 

 sists in the fact that the cover to the air-chambers, which represents 

 the epidermis, and the ventral scales, iierish at an early period. The 

 walls of the chambers and the layer of cells which form tluir floor 

 then alone remain, and the latter presents the appearance of being the 

 true epidermis. Whether this is the case with all undoubted species 

 of Dumortiera remains yet to be determined. 



A specimen sent from New Zealand as Dumortiera dilatata was 

 * ' Flora," Uiii. (18.v0) p. 307. 



