24 M. FOSLIE. [1899 



according to a solitary and apparently mature one that I have 

 seen, about 100 /a long and 50 /^- broad. 



In structure the spedes stands near to G. Notarisii, but not 

 showing heterocysts, nor the large cells in the perithallic layer 

 vvhich most often are to be found in the said species. The hypo- 

 thallus resembles that in the latter, only the cells smaller and 

 especially more narrow, frequentiy about 20 p- long, sending forth 

 a stratified perithallic layer the cells of which are 12 — 15 or up 

 to 18 // long by a breadth of 6 — 8 p. As in Q. Notarisii, the 

 present species also shows here and there on the surfase or even 

 farther down a layer of subh3^aline cells with thinner walls which 

 on a section are shown to be 15—24 p. long and 8 — 10 p broad. 



The species has been found at the Cape of Good Hope, but 

 the locality is unknown, coUected by W. Tyson. 



Goniolithon (Cladolithon) verrucosum Fosl. mscr. 



Thallus crustlike, the crust irregular, with wartlike excrescences 

 O.o — 1.5 cm. in diameter. Conceptacles of sporangia at length he- 

 mispheric or hemispheric-conical, 600 — 800 p in diameter. Sporan- 

 gia four-parted, 100 bj?- 40 p. 



This species forms irregular crusts which often are rather 

 extended. It sticks to a kind of loose sandstone (quartz-grain), 

 and sometimes nearly surrounds irregular masses of the latter. The 

 shape of the crust depends on that of the substratum. It is of a 

 very hard consistency, and develops numerous smaller or larger 

 wartlike excrescences which in general are 0.5—1.5 cm. in diameter, 

 including the latter attaining a thickness of up to about 2 cm. 

 Sometimes and especially in a young stage of the crust the ex- 

 crescences are small, and then rather approaching G. mamiUare 

 in habit. 



The conceptacles of sporangia are densely crowded nearly 

 all over the frond, but especially in the excrescences. They are 

 seen from above hemispheric or hemispheric-conical, 600—800 p 

 m diameter, but probably having been rather high, as it seems as 

 if the upper part has fallen away, similar to what is the case in 

 several other species. A great number of conceptacles examined_ 



