— 17 — 



Lithothamnion Phil, emend. 



2. L. fruticulosum (Kütz.) Fosl. 



List of Lith. p. 6 (non Norw. Lith.); Spongites fruticulosa Kütz. Polyp, 

 calcif. p. 33, Tab. Phyc. 19, t. 99. 



Syn. L.ramulosum Solms, Gorall. Monogr. p. 19; ex parte 1 ). 

 L . fasciculatum Solms I.e. p. 20; saltern ex parte. , 

 L. fasciculatum ß fruticulosum Hauck, Meeresalg. p. 274. 



The limits of the above species are not yet well fixed. I have taken 

 it in the same sense as L. fasciculatum ß fruticulosum Hauck 1. c. 

 Whether it also includes the coarser form delineated by Hauck 1. c. 

 t. 5, fig*. 3 is as yet not quite certain. 



In the collection from Siam are some specimens certainly rather 

 young and not well developed, but on the whole fully agreeing with 

 Adriatic and Mediterranean specimens of the present species. They sur- 

 round small stones and shells of Mollusks , forming a very thin crust 

 which sends forth partly crowded partly scattered wart-like excrescences 

 or short and thin branches up to 5 mm. long. The latter are frequently 

 knotty and rugged, often with somewhat spherical thickened ends. 



A couple of the specimens were scantily provided with conceptacles 

 of sporangia in the beginning of February. The conceptacles were how- 

 ever almost dissolved except one. This was about 400 jul in diameter 

 seen from above, with four-parted sporangia about 150 by 40 — 50//. 

 A solitary, probably cystocarpic conceptacle of a conical shape measured 

 about 600 n at the base 2 ). 



Between Koh Mesan and Cape Liant in 9 fathoms water. 

 Area: The Mediterranean, the Adriatic, and Mauritius. 



3. L. funafutiense Fosl. mscr. 



Lithothamnion Philippii f. funafutiensis Fosl. Notes Lith. Funaf. p. 3: 

 €alc. Alg. Funaf. p. o. 



*) Owing to a mistake I have in Rev. Syst. Surv. Melob. identified L. ramulo- 

 sum Phil, with L. fruticulosum Kütz. 



2 ) After this was in press, I have had the opportunity to examine authentic 

 specimens from Hauck' s herbarium. L. fruticulosum includes two forms, 

 the one with 1 — 1.5 mm. thick branches as the above mentioned, which I 

 propose to name f. clavulata. This form corresponds in the main with the 

 quoted figure by Kützing I.e. as well as Hauck I.e., t. 5, fig. 5, the latter 

 representing an old specimen. It sometimes assumes an almost globular 

 shape with nearly fastigiate branches (specimens from the coast of Greece). 

 The other form is rather coarse, in habit often much differing from the 

 former and approaching Gr. brassica-florida (Harv.) Fosl., with the branches 

 frequently 2—2.5 mm. thick. This form I name f. crassiuscula. On the 

 other hand, the coarse form delineated by Hauck 1. c, t. 5, fig. 3 seems to 

 belong to another species. 



Botanisk Tidsskrift. 24de Bind. 2 



