DR. NYLANDER ON GONIDIA AND THEIR DIFFERENT FORMS. 47 
1. Haplogonimia. — These present larger gonimia, which are 
simple, or two or several aggregated. They are very large in the 
genus Fhglliscum, involved in a gelatinose stratiiliim, and scattered 
in the thallus. 
2. Sirogonimia. — These present scytonemoid or sirosiphoid series 
of gonimia. 
3. Hormogonimia (a name proposed in Bull. Soc. Bot. Fr., 
1873, p. 264). — These are the most common gonimia, small in 
size, moniliformly arranged (few or several thus conjoined), very 
frequently contained in ellipsoid-deformed and various syngonimia. 
In Collema (or JVostoc) the whole thallus it would seem is to be 
considered as a single syngonimium ; but the genus Honmsiphon^ 
Kuetz., may be held as showing the existence of moniliform series 
typically vaginate, and that they singly constitute cylindrical 
horrnogonimic syngonimia, the vaginm being entirely confluent. 
4. Speirogonimia.—V%x\\ 2 ^p% by this name may be appropriately 
called those smaller scattered gonidia, which are similar to hormo- 
gonimia, but make no attempt towards conjunction into moniliform 
series. The genera Omphalaria and Sgnalissa* are examples of 
this gonimic form. The syngonimia are subglobose. 
As bearing upon the above subject, I may here insert the two 
following observations from amongst many others in my note 
book : — 
1. Dr. de Seynes, in Assoc. Franqaise pour Vavancement des 
Sciences^ Congres de Clermont — -Ferrandy 1876, p. 495, writes — 
“ I may be permitted to remark the analogy which there is 
between the tissue of the cellules in the thickened walls of lignicole 
Fungi and that of the filaments (hyphoe) of certain Lichens, which 
have appeared to several authors, on account of their thickness or 
their proper structure, to remove them from the fungial cellules, and 
t o overturn the theory of Algo-Lichen parasitism. The observa- 
tions which I am about to make upon the effects produced in the 
Fungi which are internally rich in cellulose, appear to me of 
such a nature as not to permit the existence of any objections.” 
Dr. de S. here errs in saying “ several authors,” for Nylander 
alone has observed and made known that protothalline licheno- 
hyphae {i.e.y the germinating filaments of Lichens) at once entirely 
differ in being penetrated, perfused, and for the greatest part 
composed of lichenine, and in various other characters, from the 
myceline hyphae of Fungi. Why does not Dr.de S. compare those 
things which have been already compared ? It was necessary for 
* In the “ Flora,” 1876. p. 558, I have made mention of arare arrange- 
ment, where (in Synalissa) gonimia at length reniform are beheld, and 
infixed singly to the apex of the filamentose ramule (in the impressed 
portion). 
