240 



April 30, 1898. — Several of the pieces have died altogether. 

 One or two of the tips of those still living are expanding 

 laterally, and have a distinctly prothalloid appearance. 

 Two or three other tips have run out from the rachides into 

 long slender ribbon-like processes which branch dichoto- 

 mously though at longer intervals than in unco-glomeratum. 



May 5, 1898. — One of the tips has assumed the character 

 of a definite prothallus. It has increased considerably in 

 size, being now about J of an inch in diameter, and root- 

 hairs are visible upon both its upper and lower surfaces. A 

 tiny bud, I think, can be perceived at the bifurcation of one 

 of the ribbon-like processes noted April 30. 



June 1 . — The largest prothallus has a bud upon its upper 

 surface near the sinus, but not proceeding from it. 



June 3. — A tiny frond is emerging at the sinus from the 

 underside of the prothallus. The bud on the upper surface 

 is more distinct and shows white silvery scales. 



June 6. — The tiny frond is beginning to branch, being 

 now bifurcate and still unrolling. The bud upon the ribbon- 

 like process, noted May 5, has developed into a ramulose 

 frond characteristic of unco-glomeratum. The process from 

 which it sprang is decaying without having produced any 

 prothallus. 



July 4. — The frond from the sinus of the prothallus is 

 ramulose and characteristic ; another is pushing up along- 

 side it. The bud on the upper surface is throwing up two 

 fronds. A curious fleshy translucent process is emerging 

 from the side opposite to the sinus of prothallus No. 1. 

 One or two other prothalli are developing root-hairs ; one 

 other prothallus (No. 2) is i of an inch in diameter. 



July 10. — A bud is visible on the upper surface of pro- 

 thallus No. 2, Two other bulbils have appeared on the 



