ICONES SELECTS HYMENOMYCETUM HUNGARI^. 29 



alhiis, Bongardii, tricholoma, tephroleucvs, solstitialis, comos7ts, terri- 

 genus, nudipes, centunculus, ravidns, ohturatus, vitellmus, and hiidcus. 



Print and plates are most exquisitely finished, the last even better 

 than those of the first part ; the descriptions, as well as the repre- 

 sentations, however, merely bear upon the form and colour of the 

 sporocarpium, without touching upon the interior structure and the 

 mycelium of the plant. This may appear strange at a time when 

 the principal object of mycology seems to be observing the various 

 forms of carpium as it is developed from the mycelium. This 

 remark, however, is no blame upon the author, who performed his 

 task perfectly as far as it has been defined to him. 



The representations of A. ohturatus and hiidcus are certainly 

 superfluous, they having been given in " Letell. Icones Fungorum ;" 

 so is also superfluous A. atrovirens (Kalkbrenner), there existing 

 already an A. atrovirens (P.) Fr. Hazslinszky. 



PALMODICTYON VIRIDE. 



I have much pleasure in making known the discovery of Pal- 

 modictyon viride (Kiitzing) as a native of this country. I met 

 with it about a week ago in the Exeter Canal, lialf a mile below 

 the city. Not knowing the plant myself, and after searching all 

 the works on the subject I had at my command, I forwarded speci- 

 mens to my friend Professor Dickie, of Aberdeen, who kindly 

 writes me this, June 18th: — "The plant is Pahnodictyon viride 

 (Kiitzing), and so far as I know new to the British list." The 

 plant, where it has sufficient room to develop itself, spreads over 

 the bottom, in water about six inches deep ; beyond this it comes 

 in contact with Elodes canadensis, over which it creeps, and ex- 

 tends its growth from branch to branch into deeper water. In 

 this extension it has first the appearance of a Conferva, which I at 

 first took it to be ; but the moment I touched it, after taking 

 some from the water, I found from the soft slimy feel that if a 

 Conferva it was new to me, and the microscope soon revealed the 

 true character. When the plant grows on the bottom it shows one 

 continuous green membrane, stretched tight over the bottom, but 

 when it comes in contact with other plants it throws out filaments, 

 the thickness of which is difficult to make out on account of their 

 adhesive nature; for wherever they touch it is matter of impossibility 

 to separate them. The membrane forming the filaments is structure- 

 less, but the sphserical cells, which form more or less moniliform 

 threads sometimes running in parallel lines, at other times forming 

 an irregular net work on the inside of the filaments. These cells 

 sometimes divide into two portions, at others into four, and in most 

 of the mature cells may be observed four cellules. 



Edward Parfitt. 



