178 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
them as either thickened at one or both ends, and he divides the species of Pla- 
tysma into sections, according as their spermatia have the one or other cha- 
racter. This [have not specially noticed. But either NyLANDER or his printer 
makes a strange mistake, in his ‘“‘ Prodomus” or “ Synopsis,” in regard to the 
names of the species having spermatia thickened at one or both ends. In the 
former volume (p. 49), he arranges under,— 
A. “ Spermatia versus apicem modo alterum fusiformi-incrassatula,” 
P. cucullatum and P. nivale ; and under,— 
B. ‘‘ Spermatia apice utroque leviter fusiformi-clavata,”’ 
P. juniperinum, glaucum, and sepincolum. 
In his Synopsis, again (p. 37), he gives, as instances of,— 
I. “ Spermaties aciculaires un peu épaissies en fuseau a l’une de leurs extré- 
mités (spermatia acicularia versus alterum apicem leviter fusiformi-incrassatula),” 
P. glaucum and P. juniperinum ; and, of— 
II. “Spermaties aciculaires trés légérement épaissies en voisinage de leurs 
extrémités (spermatia versus utrumque apicem levissime fusiformi-incrassata),” 
P. nivale and P. cucullatum ! 
There is surely some typographical error to account for such a manifest con- 
tradiction ! 
Species 1. P. nivale, L., 
Which occurs in northern America, as well as in Europe. Its spermogoniferous 
states constitute the var. 0. denticulata of Scumrer. (Enum., p. 14, “ Thali ora 
nigro-denticulata.”’) 
Specimen 1.—Letcut. exs. 43; Clova, Scotland. The spermogones are deep- 
brown or black, minute, round, prominent warts, fringing the crisped edges of the 
laciniz, or seated on tooth-like prolongations from their margins. The ostiole is 
inconspicuous. The spermatia are rod-shaped, about ;,th long, and .;;,th broad; 
the sterigmata consist of a few irregular articulations. 
Specimen 2.—ScHARER exs. 19; Switzerland. Spermogones as in No. 1. 
Specimen 3.—Disco Island, Arctic America, Dr LyauL, 1852; no apothecia; 
spermogones abundant. FRANKLIN’s first journey; broad-lobed form of thallus. 
Both apothecia and spermogones abound. In Herb. Hooker, Kew. 
Specimen 4.—Lochnagar, Braemar, Professor Dickie; specimen closely re- 
sembles P. cucullatum, and is apparently a transition form. 
Specumen 5.—Sugar-loaf Mountain, County Wicklow, Ireland, in which 
country it is very rare; D. Moore, in Herb. Carroll; no apothecia, but spermo- 
goniferous. 
Specimen 6.—Plants of Braemar, No. 394, coll. by A. Croatt of Montrose; 
source of Dee, August 1855 ; spermogones as in No. 1. 

