264 MR. F. W. STANSFIELD ON APOSPORY IN 
One or two of the tips of those still living are expanding laterally, 
and have a distinetly prothalloid appearance. Two or three 
other tips have run out from the rhachides into long slender 
ribbon-like processes which branch diehotomously 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 3 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 l.—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 distinet and shows white silvery seales. 
Fig. 1. Fig. 9. 
Fig. l.—Side view of prothallus developed from extreme tip of pinnule. 
May 5. 
Fig. 2.— Development of prothallus. June 3, 
June 6.—The tiny frond is beginning to branch, being now 
bifureate and still unrolling. The bud upon the ribbon-like 
process, noted May 5, has developed into a ramulose frond 
characteristie of wnco-glomeratam. The process from which it 
sprang is decaying without having produced any prothallus. 
July 4.—The frond from the sinus of the prothallus is ra- 
mulose and characteristic; another is pushing up alongside 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 3 of an inch in diameter. 
July 10.—A bud is visible on the upper surface of prothallus 
No.2. Two other bulbils have appeared on the growths from 
