122 



sporangia „ generally, after the tormation of spores has begun, 

 about 95 jj. long and 20 <j. thick". As I possess some specimens 

 determined by Kjellman himself there can be no doubt as to 

 the identity, but I found the conceptacles to be larger than in 

 most other of the northern Lithothamnia, or of about the same 

 size as those mentioned by him under L. alcicorne, 400—500 tt 

 in diameter seen from the surface, though rather varying and 

 partly even a little more. However, I also met with smaller, but 

 they appeared not to be fully developed, and they are then easily 

 confounded with those of L. flabellatum, but they may perhaps 

 be more varying than I have seen. They are frequently very 

 densely crowded, and then the roofs being angular, occasionally 

 almost fully confluent, sometimes over the greater part of a branch, 

 and not only to be found in the upper branches, but nearly eve- 

 rywhere and even in the central portions of not too densely bran- 

 ched specimens both of f. typica and f. globosa. The roof is in- 

 tersected with* 70 — 80 muciferous canals, and the four-parted spo- 

 rangia are up to about 200 fi long and 80 /x broad 



The cystocarpic conceptacles sometimes appear in the same 

 individual bearing those of sporangia sometimes and most fre- 

 quently in other individuals, scattered and in great numbers nearly 

 everywhere, though especially in the upper part of the branches, 

 occassionally in pairs, fully anastomosed, with two orifices nearly 

 approaching to one another. They are commonly about 600 /j- 

 in diameter at the base, conical, rather high, towards the apex 

 more or less constricted and traversed by a rather coarse canal. 

 The carpospores are much varying in shape, frequently, however, 

 elliptical or broadly cuneate, 70 — 100 ;x long and 40 — 50 /abroad 

 in the broadest part. 



Some few other conceptacles that I found in the same indi- 

 viduals bearing the latter are smaller, about 300 ti in diameter at 

 the base, and probably those of antheridia. I, however, have not 

 seen the spermatia. 



Remark on the synonomy. The plant recorded by Ellis 1. 

 c. from Falmouth and the Isle of Man as „Cor allium pumilum 

 album, fere lapideum, ramosum" is by different older authors 



