12 M. FOSLIE. [1900 



short axes, tangled, curved or suberect, rather crovvded and ana- 

 stomosing, subfastigiate, terete or subcompressed, in the lower part 

 2 — 3 mm., upwards attenuating, 1.5 — 2 mm. thick. Conceptacles- 

 of cystocarps convex, subprominent, 250 — 300 />- in diameter. 



I have seen but two specimens of this species. The one is 

 5 — 6 cm. in diameter and 3 cm. thick, the other about 10 cm, 

 long, 3 — 4 cm. broad and 3 cm. thick, the latter apparently being 

 two specimens which have anastomosed. 



On a longitudinal median section of the upper part of a branch 

 the pith layer is composed of regularly alternating long and short 

 cells. The former are 34 — 46 ll long and 6—8 ut broad, the latter 

 15 — 25 ij. long, and thinwalled. The cells of the rather vigorous 

 perithallic layer are square or frequently elongated, up to twice as 

 long as broad, or 7 — 15 Lt long. 



The conceptacles of cystocarps are somewhat crowded in the 

 upper part of the branches, convex, subprominent, with a single 

 orifice, 250 — 300 //. in diameter seen from above. On a section 

 they sometimes appear almost half-moon shaped. Conceptacles of 

 sporangia are unknown. 



The present species seems to stand nearest to L. hyssoides? 

 but is a little coarser and the branches frequently more curved. 

 ln structure it differs much from the latter and rather approaches 

 Lithoph. moluccense. 



The place of growth of this easily recognisable species unfor- 

 tunately is not knovvn with certainty, however either being Mauritius 

 or the West Indies. A specimen is labelled „ Mauritius? Coll. 

 Agassiz", lierb. Far lo w, no. XXXIV, and another one „locality 

 unknown, coil. A gass iz", lierb. Farlow, no. XXXV, but the latter 

 most probably has been gathered in the same place as the former. 



L. Farlowii Fosl. mscr. 



Thallus forming up to about 1 mm. thick crusts on stones,. 

 with numerons irregular, about 1 mm. thik but often anastomo- 

 sing tubercles or short branches. Conceptacles of sporangia sub- 

 prominent, subhemispheric, with an apical pore. Sporangia four- 

 parted, 90—100 // long by 50—60 ;j-. 



