142 HERBARIUM MYCOLOGICUM (ECONOMICUM. 



4. Lecidea mesotropiza. Nyl. — Thallus white, verrucose, mode- 

 rate (K -f yellow) ; apothecia black, convex, immarginate, bluish- 

 grey within; spores 8 na?, colourless, ellipsoid, 0,011-12 m.m. 

 long, 0,007 m.m. thick ; paraphyses not very well discrete, epi- 

 thecium dark greenish-blue ; hymeneal gelatine bluish, the thecal 

 violet-coloured with iodine. 



On schistose stones of an old wall on the hill of Ardo, near Aber- 

 deen, very sparingly. (Crombie, August, 1872.) From Lecidea 

 mesotropoides, its nearest ally, it differs amongst other characters by 

 the verrucose thallus and the bluish epithecium. The apothecia 

 are sometimes slightly pruinose. 



HERBARIUM MYCOLOGICUM (ECONOMICUM. 



The first Fasciculus of this publication, comprising specimens 

 of 50 species of those fungi which exert a baneful influence upon 

 agriculture and horticulture ; and also those which take part in 

 the administration of household ceconomy, has just been published 

 by Baron Thuemen of Teplitz. 



The aim of the editor has been to give ample and characteristic 

 specimens, in order that the study of those species of fungi which 

 are hurtful to our cultivated plants or forest trees, may be facili- 

 tated, as it is only in this way that we can hope to combat the 

 ravages of our numerous enemies. Consequently the greater 

 portion o f this fasciculus consists of those species which have their 

 abode upon living plants. Puccinise, Uredines, and Peronosporse 

 find several representatives. 



Amongst the more interesting species contained in this fasci- 

 culus are, Uredo sorghi (Pers,), Puccinia Helianthi (Schw.), P. 

 maydis (Pbtsch.), Ustilago destruens (Schl.), Uredo cichoracearum 

 (D.C.), var. Endivce, Phacidium medicaginis (Lasch.), Exoascus 

 pruni (Fckl.), Septoria olece (D. & M.), Septoria Mori (Lev.) 

 Hysterium nervisequum (D. C), Oidium lactis (Fr.), Saccharo?nyces, 

 apicidatas (Rees), and several others. 



The specimens are very good in quality, and abundant in quan- 

 tity, each species being enclosed in a separate paper wrapper, their 

 examination is greatly facilitated. Upon the whole, the author, 

 Baron Thuemen, must be congratulated for the eminently practical 

 turn this publication gives to the study of Fungology. 



Charles B. Plowright. 



Potato Disease. — The time for the preparation of the prize 

 essay, for which one hundred pounds has been offered, is now ex- 

 tended from March until the autumn, in order to give more oppor- 

 tunity for original investigation. 



