280 DR LAUDER LINDSAY ON THE SPERMOGONES, &c., OF LICHENS. 
times expands, with age, to such an extent as to give the spermogone the appear- 
ance of a young apothecium. The spermatia are rod-shaped, about jth long, on 
arthrosterigmata about ath to ;;th long. The spermogones and spermatia of 
L. Hildenbrandii, Garov., are similar to those just described. 
GENUS V. Osryzum, Wallr., Tul. 
This genus is represented by its single species, O. corniculatum, Wallr. It 
possesses angiocarpous apothecia, which are so small that they are very apt to 
be overlooked, unless very carefully sought for. The spermogones are also very 
small and inconspicuous; they are scattered about the ends of the lobes, and 
generally resemble those described under Collema. Their diameter is about th. 
The plant closely resembles Leptogium palmatum ; but its angiocarpus apothecia 
distinguish it. 
[The Author has embodied his Researches on the Spermogones and Pycnides - 
of Crustaceous Lichens in a separate Memoir, similar in length to the foregoing 
Memoir, and illustrated by an equal number of drawings. This Memoir on Crus- 
taceous Lichens will include one or two genera, such as Hndocarpon and Nor- 
mandina, which have not strictly a crustaceous thallus, but which, nevertheless, it 
would be inconvenient and unscientific to consider apart from their ally,—the 
extensive and important genus Verrucaria. It will also include the Calicei (genera 
Sphinetrina, Caliciwm, and Coniocybe), which are usually associated in classifica- _ 
tion with the Spwrophorei, but which have a horizontal crustaceous thallus, on 
which the spermogones are seated, or in which they are contained or immersed.] 

