184
THE ESSEX NATURALIST.
breaks up on maturity into areolae, exposing the shining trans-
lucent inner layer; the capillitium and spores resemble those
of P. pedata.
It is interesting to note that P. pedata is the fifth species new
to Essex which J. Ross has found within the last few years in
the same region of Epping Forest under trees most of which are
not native, such as Sycamore, Norway Maple, Grey Poplar,
Sweet Chestnut, etc. The other species are Physarum contextum
Pers., Mucilago spongiosa (Leyss.) Morgan, Perichaena vermi-
cularis (Schwein.) Rost. and Lepidoderma Chailletii Rost. The
last is an uncommon species in this country and was obtained
by Mr. Ross recently in the same copse, four years after he first
found it there. In England it has been recorded only in winter;
in Switzerland it is abundant on turf in alpine regions after the
retreat of winter snows.
DESCRIPTION OF THE PLATE.
Perichaena pedata.
1. Four free sporangia of various sizes and a cluster of three.
2. A sporangium dehiscing, the walls breaking up into areolae.
3. A sporangium showing a saucer-like base remaining after the dispersal
of the upper walls, the capillitium and spores.
4. A fragment of the sporangium-walls, with capillitium and spores.
ADDITIONAL RECORDS OF ESSEX PLANTS.
By GEO. C BROWN.
A NUMBER of records of Essex plants having accumu-
lated since the publication of my paper on the alien
plants of Essex in the Essex Naturalist, vol. xx., p. 31 (1926),
it seems desirable to put them on record. Owing to the now
almost exclusive use of English or North European barleys for
malting, affecting, among other localities, the sites at Hythe
Quay, Colchester, for many years so prolific in alien plants, I
am not able to add many aliens from my own observations. A
number, however, has been recorded in various publications
by other observers, and I have endeavoured to bring these
together with, in addition, some notes on the occurrence of
native species of interest.