HoLLOWAY. — Studies in the New Zealand Species of Lycopodium. 269 



the elongation of the upper surface. This would seem to indicate that 

 the horizontal extension of the upper region of the prothallus follows 

 a more or less definite axis of growth. Ihe largest prothallus found — 

 that shown in figs. 29 and 30 — was 6 mm. in length, the average size of 

 a mature specimen being from 3 mm. to 4 mm. 



L. ramulosum. 



The figures illustrating the prothallus of this species are numbered 

 from 32a to 32g inclusive. The youngest prothallus found was about 

 1 mm. in height, and is shown in fig. 32a. It will be seen that in 

 general form it corresponds with the young prothallus of L. inundatum 

 figured from de Bary by Goebel (10, p. 191, fig. 3). The lower rounded 

 region was infested by a fungus, which extended somewhat up one side 

 of the shaft. At its upper end the prothallus was extended into two 



] ^-TM 



Fig. 32a. — Lycopodium ramulosum. Young prothallus. x 20. 



Figs. 22^-^21).— Lycopodium ramulosum. Prothalli of long-drawn-out form, showing 



fungal regions, &c. X 12. 

 Figs. 32 e, 32f. — Lycopodium ramulosum,. Prothalli of stout, massive form, attached, to 



young plants, x 12. 

 Fig. 32g. — Lycopodium, ramulosum. The lower extremity of prothallus shown in 



fig. 32 F. X 35. 

 Fig. 32h. — Lycopodium ramulosum. Protocormous rhizome, showing stem-axis, first 



root, and two vegetative bulbils. X 4. 



processes, which had a slightly brownish appearance, as if withered. 

 At the base of one of these processes was a darkly staining cell, possibly 

 an antheridium. Below the upper end of the prothallus, on the under 

 side of a short lateral process, three epidermal cells were seen to be 

 infested by the fungus, and a rhizoid Avas borne on one of the adjacent 

 cells. Rhizoids were also present on the lower end of the prothallus. 

 Three young prothalli of this age were found. AH the prothalli found 

 were, in general, of the L. cernuum type, but they presented some 



