396 
MARSILIACE.E. 
Lanarkshire. — Mr. Gourlie informs me that Mr. Ure found 
the Pillwort near Rotherglen, in this county. 
SuTHERLANDSHiRE. — Professor Graham informs me he has 
gathered it in great abundance in a ditch by the road-side, three 
miles above Invershinn, towards Oikel. 
In Ireland it appears to be a plant of rare occurrence. I give 
the only localities I find recorded. 
Antrim. — “ Abundant in marshy ground about two miles from 
the mouth of the Blackwater, near Lough Neath : Mr. J. Camp- 
bell. In a ditch by the river Bann, a little below Jackson’s 
Hall, Coleraine : Mr. David Moore.” — • Mackaifs Flora Hiher- 
nica. 
Galway. — It appears from Dr. Wade’s ^Plantse Rariores’ 
that the Pill-wort has been found near Ballinahinch, in this 
county. 
The figures of this plant are generally characteristic, but 
nearly all of them err in not representing it sufficiently slender ; 
the best I have seen are those by Bernard de Jussieu, published 
in the ^ Memoires de I’Academie Royale des Sciences,’^ and by 
Mr. Valentine, in the ^ Transactions of the Linnean Society.’f 
The Linnean name of Pilularia glohulifera appears to have been 
adopted by all subsequent writers. 
The roots are generally two or three inches in length, very 
flexible, slender, and but slightly branched ; they are hollow, 
and divided by several longitudinal septa ; they appear to 
descend perpendicularly into the mud or moistened earth in 
which the plant is found : they spring from a creeping rhizoma, 
which is also hollow and longitudinally divided ; it is very slen- 
der and cylindrical, and the terminal or growing portion is in- 
variably covered with a close investment of scales or scale-like 
hairs ; these, like a similar investment common to the creeping 
rhizomas of Polypodium vulgare^ Davallia canariensisy Tricho- 
manes speciosumy and several other ferns, fall off with age, leav- 
ing the rhizoma perfectly naked and smooth. The roots spring 
from the rhizoma at intervals of considerable regularity, usually 
measuring about the third of an inch : they are generally three 
* Mem. Acad. Roy., 1739, tab. 1 1. 
f Trans. Linn. Soc. xviii. tab. 35, 
