EXTRACTS AND ABSTRACTS FROM FOREIGN JOURNALS. 151 



1. The Mycodermata of Tinea favosa are contained in proper cap- 

 sules ; the Cryptogamia of Muguet, on the contrary, 'are developed 

 on the surface of the epithelium, and not in capsules. 



2. In the Mycodermata the moniliform ramifications are transformed 

 into sporules, whilst in the Muguet the sporules are developed on the 

 sides of the ramifications. 



3. The cellules of Mycodermata are not well developed and do not 

 present internal nuclei ; on the contrary those of Muguet have very dis- 

 tinct nuclei. 



4. The ramifications of Mycodermata are curved, whilst those of Mu- 

 guet are rectilinear. 



5. The ramifications of Mycodermata do not possess cellules at the 

 point where they are given off from the stem,, whilst those of Muguet 

 present them. 



Exposed to atmospheric air, the cryptogamia became dry, their cel- 

 lules become slightly rugose and more transparent ; in drying them 

 with the epithelium in which they were developed, the rootlets can be 

 followed to their very extremities ; in water they swell ; in milk they 

 may be preserved as in water, without becoming more developed ; by 

 maceration in water they do not alter ; after the death of the individual 

 these vegetables do not undergo any change until the period when In- 

 fusoria become developed and destroy them by degrees. 3rd May. 



Le'veille on the genus Sclerotium. In this memoir the author enume- 

 rates the great number of species that have been comprised in the genus 

 Sclerotium, and shows that this supposed genus is formed of individuals 

 of a different nature which ought not to be found united. 



The genus Sclerotium may be divided into four sections. The first 

 comprehends those pathological alterations produced by insects or parasi- 

 tic Fungi ; the second, Fungi in the act of growth or arrested in their 

 development ; the third, species belonging to other genera which have 

 served to form new ones ; and the fourth, species nothing else whatever 

 but varieties. 



In considering the place in Mycological classifications, which Sclero- 

 tium ought to occupy, he shows by observations that it is decidedly mis- 

 placed, because it forms imperfect beings, mere sketches of vegetation, 

 presenting no trace of organs of fructification, and which in spite of 

 that, under the influence of given circumstances, vegetates afresh and 

 produces perfect Fungi. Thus the Sclerotium fungorum gives birth to 

 the Agaricus parasi ticus, the Sclerotium lacunosum to Agaricus racemosus, 

 Sclerotium pus tula to Peziza Candolleana, Sclerotium durum to Botrytis 

 cinerea, &c. These facts established upon a large number of observations, 

 are in a measure verified by other similar^ ones taken from Rumphius, 

 Micheli, Tode, Corda, &c. 



He at length compares Sclerotium to other equally barren modifica- 

 tions of the fungoid tissue, and he endeavours to show that these pro- 

 ductions are only forms of mycelium or the primitive element of Fungi 



