55 



Syn. Lithothamnion fasciculatum Aresch. Obs. Phyc. 3, p. 5 ; ex parte 

 sec. spec. 



Remark on the species. In Contrib. 1. c. I recorded a Litho- 

 thamnion under the name of L. norvegicum f. globulata, considering 

 it to be a form of the named species analogous to the form glo- 

 bosa of L. tophiforme (L. soriferum). Later I met with the same 

 form also at other places together with another one, that consti- 

 tutes the typical form of an undescribed species, the above L. 

 apiculatum,, to which the named f. globulata (the above f. patula) 

 appears to be more closely related than to L. norvegicum (L. 

 coralloides in the present paper), taking the latter in a more con- 

 fined sense than then. On the other hand it is not unlikely that 

 this form may perhaps be the type of a separate species, as in 

 some particulars it rather differs from typical L. apiculatum, al- 

 though it in habit as well as structure is very difficult to distinguish 

 from the latter, but the reproductive organs are not yet well known, 

 the cystocarpic conceptacles even unknown. 



Description of the form of the species. The limits between 

 most of the above quoted forms are not easily drawn, as inter- 

 mediate forms nearly as often appear to occur as typically deve- 

 loped specimens of the one or other form, but the latter are on 

 the other hand so well marked, that they ought to be specially 

 mentioned. What I consider to be the typical form of the species, 

 forms spherical or nearly spherical balls, freely developed on the 

 bottom, seldom fastened to or encompassing smaller stones. It 

 attains a diameter of 5 cm., frequently, however, about 3 cm. 

 The colour partly is a darker partly a lighter pink, more or less 

 fading in drying, now and then with a purplish tinge, or even 

 rosy. The solid central mass always -is insignificant, and ramifi- 

 cation sets in at an early stage of growth. The frond is branched 

 partly in a subdichotomous manner partly more irregular, with 

 axes of two or three orders. The upper branch- systems sometimes 

 are arranged obpyramidal. In typically developed specimens the 

 branches are erect, fastigiate and straight, in others they are some- 

 what bent, but always fastigiate, often furnished with some wart- 

 like process. They are terete or nearly terete, either cylindrical 



