VINE AND HOP. 6' 



precisely of the same nature as the sporangia, but exhibiting, 

 independently of the mere conidia of the Oidium, a second form of 

 fruit, as in many other fungi. On the 5th of September of the 

 following year (1 852), a paper was read before the Royal Academy 

 of Georgofili of Florence, by Professor Amici, in which he reports 

 the discovery of bodies in the grape mildew of precisely the same 

 nature and mode of production as those in Dr. Plomley's figure. 

 It will be found from Prof. Amici's memoir, a translation of 

 which appeared in tlie last volume of this Journal, that he does 

 not allow the above-mentioned connection between the Erj'siphe and 

 Oidium, nor indeed at present have true ascigei'ous sporangia been 

 detected in the grape mildew. These bodies were not, however, 

 found merely in the grape Oidium. Prof. Amici informs us in his 

 memoir, that they had occurred in the mildew of Convolvulus 

 arvensis accompanying an Erysiphe ; and I have lately received a 

 very kind letter, in which he sends specimens of Oidia bearing 

 transformed cells, not only in the Vine and Convolvulus, but also 

 on the common Gourd, the Hop. Plantago major, and Trifolium 

 pratense (Fig. 3). He also found them on Artemisia campestris, 

 but I have seen no specimen. Dr. Plomley has detected them 

 abundantly in the Oidium of the rose. I had, indeed, previously 

 seen specimens of the transformed joints in the vine mildew, for 

 Cesati's Ampelomyces quisqualis, Rahenhorst, n. 10G9. b, pub- 

 lished in 1859, is undoubtedly the same thing, though the bodies 

 contained in the cells are rather smaller than in Amicis specimens 

 (Fig. 4). 



This, however, is not the only name which has been imposed 

 upon these bodies, as though it were still the fate of fungi to have 

 generic importance ascribed not only to their mycelia but even to 

 their separate organs ; for Ehrenberg, who received liis specimens 

 from Amici himself, gave them the name of Circinobolus floren- 

 tinus ; and Riess in Hedwir/ia, 1853, p. 23, tab. III. fig. 2, d, 

 e, f. has given to similar bodies in Erysiphe lamprocarpa, the 

 name of Byssocystis textilis. 



In the early part of 1853, Tulasne published in the Botanische 

 Zeitimy some admirable observations on the genus, without, how- 

 ever, having had the advantage of seeing any of Amicis specimens 

 or those published by Piabenhorst. His remarks refer principally 

 to two species belonging to the genera Uncinula and Phyllactinia, 

 of Leveille, in which he found the bodies in question, to which he 

 gave the name of pycnidia, as being identical in function and 

 essential structure to those which he had before so cliaracterissd 



