Bibliographical Notices. 185 



crevices of the limestone cliiFs which encompass the summit, as also 

 on the steep slopes, which were, besides, covered with Asphodelus 

 ramosus, L., the before-mentioned Iberis and Anthyllis. Here too 

 occurred, although but very few specimens, in the region of the Saxi- 

 frages, a pretty Tulipa, which appears to be new, since it differs 

 from T. Celsiana, which it resembles in the colour of its flower, by 

 "foliis reflexis, flore nut ante (nee erecto) et perigonii segmentis lanceO' 

 latis {nee oblongo-laneeolatis)," setting aside the difference of ha- 

 bitat, since T. Celsiana only presents itself in the warm region. 

 Lastly, on the highest rocks of Sta Maria flourish Muscari botry^ 

 oides, and especially Armeria alliacea, W., in great abundance. 



The very small number of Crj^ptogamia, even in the mountain and 

 alpine regions, is striking. The bark even of the older trees is ge- 

 nerally quite bare, or at the most covered with a layer of Parmelia 

 parietina ; the rocks also are for the greater part devoid of all 

 Lichens. In the springs a Char a is found, yet no Algae, and of 

 mosses and ferns, very few occur in the upper mountain and alpine 

 region. Of ferns I have observed, on the rocks of Sta Maria, only 

 Ceterach officinarum, Asplenium Trichornanes and A. fontanum-, of 

 mosses, besides some barren Hypna, only an Encalypta and Frullania 

 hispanica, N. ab Es. ; the latter indeed, like the liverworts of our 

 mountains, in thick tufts. The cryptogamic flora is said to be more 

 considerable in winter. 



BIBLIOGRAPHICAL NOTICES. 



Die Kieselschaligen Bacillarien oder Diatomeen. Von Dr. F. T, 

 Kiitzing: Nordhausen, 1844. Tab. 30. p. 152. 



The beauty and correctness of the plates in the * Phycologia Ge- 

 neralis,' which we have already reviewed in our Journal, has excited 

 the admiration of all who have noticed or consulted the work. Those 

 of the present are equally deserving of praise, and maintain the re- 

 putation of the author as an excellent draughtsman and accurate ob- 

 server. A certain proportion of the figures are professedly copies, 

 but wherever the author has been able to prepare the illustrations 

 himself he has not failed to do so, and the instances to the contrary 

 are not so numerous as to detract from the originality of the work. 

 Dr. Kiitzing, to whose kindness we are indebted for our copy, has 

 profited by all the materials which came within his notice, and 

 if we mistake not also by the criticisms to which his former work 

 was subjected, not indeed as regards the illustrations but in respect 

 of its plan, and especially of his notions of genera and species. In 

 the present instance the species are all defined, the principal syno- 

 nyms noticed, and some details given under each generic head, in all 

 which points the * Phycologia ' was very deficient. It is we under- 

 stand his intention to publish the Desmidiacece in a similar form, and 

 we do not doubt that we shall find the same progressive improve- 

 ment which we so gladly hail in the present instance. He will we 

 know be most grateful to those who have studied this curious and 



