100 



ceptacles of sporangia and agrees perfectly with the specimens that 

 I have seen. In this respect Harvey's plant fully coinsides with 

 the above quoted f. depressa, only the conceptacles frequently a 

 little larger. The point-like depeenings are, in the named specimens, 

 at first 40 — 50 p in diameter, in a more advanced state getting 

 larger, about 70 — 80 p in diameter, and, so far as I have seen, 

 always with a single orifice, which towards maturity becomes 

 larger, or the whole bottom, a part of the roof, as well as the 

 lower part of the depressed edges of these depenings get dissolved, 

 especially in dead specimens even the whole roof, and then for- 

 ming distinct holes about 200 — 300 p in diameter. I found nume- 

 rous sporangia, but at least most of them appeared not to be fully 

 developed, unparted or bisporic and among the latter some few 

 with apparently a fully developed wall, as in the above mentioned 

 French specimen of f. depressa. I, however, also found a couple 

 of tetrasporic ones and two others with indistinst partition of the 

 one or both just formed cells. I, therefore, consider mature and 

 normaly developed sporangia to be tetrasporic. They are very 

 much varying in shape and size. Sometimes I found them 120 — 

 150 p long and even up to 65 p. broad, sometimes and apparently 

 in the same state of development only about 90 p long and 30 — 40 

 p broad. Overgrown conceptacles partly are very numerous partly 

 few. In one of the specimens bearing conceptacles of sporangia 

 I also found a couple of other conceptacles, which probably are 

 those of cystocarps. The}^ nearly agree in shape with those in 

 f. depressa, but are a little larger, or up to 250 p in diameter at 

 the base. 



This form, which I propose to name f. Harveyi, can hardly 

 be considered a separate species. It is nearly connected with f. 

 depressa, and especially the above mentioned specimens from Man- 

 dal shov complete transition. On the other hand it is, in its most 

 extreme form, much differing, and a specimen from the west coast 

 probably belonging to the present form even somewhat approaches 

 L. crispatum Hauck 1. c. t. 2, fig. 3 in habit, and Mr. Batters 

 informs me, that it often comes near L. expansum in appearance. 

 It seems to be extremely varying, the primary crust often nearly 



