Information respecting Botanical Travellers, 32? except size and colour. The structure is very different from that of Pachyma Cocos, Schwein, Plate VII. fig. 2. 1. Scytonema arenarium, n. s. Forming a thin uniform yellow brown stratum for some inches over sand, which it binds together by means of numerous transparent colourless rooting filaments. Threads obtuse, flexuous, here and there shghtly branched at the base, and rooting ; border thick trans-parent gelatinous ; sporangia obscure, seldom visible, occupy-ing only about a half of the central tube. Plate VII. fig. 3. The specimens described above are in the rich collection of Sir W. J. Hooker, who has kindly lent me all the fungi he possesses. Out of the twenty-seven species sent by Messrs. Lawrence and Gunn it will be observed that twelve are com-mon European fungi. Amongst them is a specimen of P«r-melia parietina on an apple twig, on which perhaps it had been introduced from England. REFERENCES TO PLATE VII. Fig. 1 . Mitremyces fuscus, with its calyptra ; one of the individuals is cut open to show the inner peridium ; a. sporidia; h. a horizontal section of one of the processes of the mycelium very highly magnified ; c. sporidia and flocci of M. coccineus. Fig. 2. Flocci of Mylitta australis from the transparent veins, very highly magnified. Fig. 3. Scytonema arenarium ; a. filaments and rootlets ; b. a filament more highly magnified ; c. a portion of a filament with sporangia. XL. — Information respecting Botanical Travellers, Mr. Gardner's Journeys in Brazil, Villa do Crato, Sertao of the Province of Cear&, December 5, 1838. When I had the pleasure of writing to you from the Villa do Ico I expressed myself doubtful as to the success which might attend my visit to this neighbourhood. After a residence, however, of nearly three months in this town, I am happy to inform you that my fears have been agreeably disappointed, and before proceeding to give an account of the nature of the country or its vegetation, I hasten to inform you that yesterday I despatched six cases o.f plants for Eng-
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