360 Prof. E. Claparede on the Reproduction of the Aphides. 



tium-\\\ic mycelium which surrounds the perithecium iu the 

 interior of tlie plant on which it lives reminds one of S. Gra^ 

 minis, Pers., of which the preceding znay perhaps be the pycnidic 

 form. 



Previous observers of this fungus also have always found 

 only this one form of spore, and regarded it, like myself, as 

 a stylospore, and not as an ascus, which likewise might be 

 justified =^. 



Dcsmazieres first described such spores, in a Fungus which 

 occurred upon Alopecurvs, Agrostis, and Holcus, under the name 

 of Dilophospora Graminis (Ann. Sci. Nat. ser. 2. tome xiv. p. 5, 

 pi. 1. lig. 2 a J b, c). Puckel found a species of the same genus 

 npon Holcus lanatus, and published it as Dilophospora Hold 

 (Bot. Zeit. 1861, p. 250). Berkeley afterwards detected a very 

 similar fungus as the cause of disease in a wheat-field (Horti- 

 cultural Journal, 1862, No. 5). The spores, however, are de- 

 scribed by this mycologist as furnished v,'ith only three, perfectly 

 simple, much broader, linear, pointed, and not filiform appendages 

 at each end; whilst Dcsmazieres describes and figures the spores 

 observed by him as furnished with three, or even only two, fili- 

 form appendages, wdiich were sometimes simple, but usually 

 forked once or twice. Puckel describes his Dilophospora Hold 

 as breaking out from yellow^ spots on the grass-leaf — a peculiarity 

 not presented by the HolcusAenwes examined by me. 



Further observations must decide whether these differences 

 express the peculiarities of different species of plants, or only 

 variations of one spedcs. 



LII. — Note on the Beproduciion of the Aphides. 

 By Professor E. CLAPAKEDEf. 



The reproduction of the Aphides^ after having attracted the 

 attention of so many distinguished men, has recently given rise 

 to fresh investigations on the part of two observers, M. Meczni- 

 kow and M. Balbiani. The results at which these two natu- 

 ralists have arrived show plainly that the subject was far from 

 being exhausted. Each of them has worked independently. 

 The first of M. !Mecznikow^s ])ublicationsJ is anterior by some 

 months to the first communication of M. Balbiani to the xVca- 

 demy of Sciences in Paris (4th, llth, and 25th June, 1866). 

 Nevertheless the latter author seems to have had no knowledge 



* Schlcchtendal, Bot. Zcit. 1863. 



t Translated by W. S. Dallas, F.L.S. &c., from the * Aunalcs des 

 Sciences Natiuelles/ 5^ sc'rie, ttme vii. pp. 2\~2d. 



X " UntersuchuDgen iiber die Fmbryologie der Ilemipteren," Zeitschr 

 fiir wiss. Zool. xvi. p. 128. 



