NOTICES OF BOOKS AND MEMOIRS. 89 



Boswellia neglecta, S. Moore, Adhatoda harlerioides, S. Moore, Tinnea 

 heterotypica, S. Moore, Hildebrandtia africana, Vatke, (see A. Braiin 

 in ' Sitzimgsber. cL naturforscli. Freunde zu Beiiiu,' 18th Jan. 

 1876), Leptadmia ? visciformis, Vatke, Fulicaria Benschiana, Vatke, 

 Psiadia incana Oliv. & Hiern, Iphiona microphylla, Vatke, Sericocoma 

 soinalensis, S. Moore, S. pallida, S. Moore, Ulothrix Vatkeana, Echb., 

 f., Dracana schizmitha, Baker (which affords 'Dragon's blood ;' — see 

 Hildebrandt in ' Sitzimgsber. d. naturforsch. Freunde zu Berhn,' 

 19th March, 1878, and in ' Monatshrift d. ver. zur Beford. d. 

 Gartenbaues', July, 1878), Anthericum inconspicuum, Baker, and 

 A. corymbosiun, Baker. The most remarkable discovery was, how- 

 ever, the new genus of Convolvulacea, Hildebrandtia, a small shrub 

 with twigs thorny at the ends, and habit recalling that of a Lycium, 

 the tetramerous flowers of which are distinguished by the two outer 

 calyx-leaves growing in the shape of disproportionately large 

 wings when the fruit ripens. 



After returning to Aden, Hildebrandt went to Zanzibar, from 

 which he, according to his plan, set out to the Comoro Island, 

 Johanna, on which he spent the interval between June and 

 September, 1875. The luxuriant vegetation of this island, accord- 

 ing to Hildebrandt one of the loveliest in the world, of the natural 

 history of which he has given a sketch in the ' Zeitschr. d. Ges. 

 f. Erdkunde zu Berlin,' Bd. xi., 1876, pp. 87-49 (compare also 

 Just, 'Botan. Jahresber.' iv., 1876, p. 1161, No. 161), included a 

 number of new plants : — Mucuna comorensis, Vatke, Crinum Hilde- 

 brandtii,Y Sitke, Ravenea (nov. gen. Palmarum) Hildebrandtii, Bouch6, 

 Balanophora Hildebrandtii, Echb. fil., Cyathea Hildebrandtii, Kuhn, 

 Tricliomanes Hildebrandtii, Kuhn, Selayinella Hildebrandtii, A. M., 

 S. amjjJiirhizos, A. Br., of which especially worth mention is 

 Trichomanes Hildebrandtii, of which the circular fronds, as big as a 

 thaler, are closely pressed in series to the tree trunks, and much 

 suggest a great liver-moss. 



Among the fifty-four species of mosses which the traveller 

 collected on Johanna, forty-seven were new (according to the 

 determination of C. Miiller (Halens.), who has described the Hilde- 

 brandt mosses in 'Linnaea,' xL, pp. 225-300) ; the island has only 

 three in common with Madagascar and only one with Africa. 

 Among the Algae of Johanna there is a new Chroolepus (inhabiting 

 trees), and the remarkable Dictyonema sericewn, Montague, of which 

 Bornet has given a figure in his ' Eecherches sur les gonidies des 

 lichens' ('Ann. Sc. Nat.' 5 ser., tome xvii., 1870). The lichens 

 collected in East Africa by Hildebrandt were worked up by Krempel- 

 huber ('Linnaea,' xli., x^p. 135-144). 



When he came back to Zanzibar, Hildebrandt engaged his men 

 and supplied himself with what was necessary for his projected 

 journey into the interior of the dark continent to Ndur Kenia. He 

 went first to Pangani ; and since he could not follow out his plan 

 from this place he went to Lamu, in order to try to penetrate 

 from there through the South Gala countries up the Tana to 

 Kenia. Here also all the attempts of the traveller to form a 

 caravan were thwarted through the fear entertained by the Gala of 



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