Dublin Microscopical Club. 141 
dom, one station being in Scotland, near Aberdeen, originally found 
by Mr. Roy ; the other being at Connemara, and found by Mr. Archer. 
It probably most resembled Penium cylindrus (of which Mr. Archer 
now showed an example); but it is very distinct indeed. This 
form, P. rufopellitum, is of a brownish-red colour, due to an external 
roughish bark-like coating, which is occasionally shed from a por- 
tion of the superficies, the bare portion of the wall being then seen 
to be colourless. There does not seem to be any other species with 
this curious characteristic ; the reddish colour and roughish granular 
superficies belonging to Penium cylindrus do not appear to be due to 
an outward coating capable of exfoliation. 
March 15, 1888. 
Vaucheria sessilis showing septation.—Dr. E. Perceval Wright 
exhibited some specimens, which had been some years mounted, of 
Vaucheria sessilis, showing the septation of this form, which was 
to be met with in the winter or early spring months. His object 
in doing so was to direct attention to Dr. M. C. Cooke’s ‘* Notes on 
Vaucheria” in the current (March) number of ‘ Grevillea,’ in which 
he describes and figures septation of the filaments in a Vaucheria, 
stating that such had not been previously recognized. In a foot- 
note Dr. Cooke remarks that the septation which he figures differs 
materially from that detailed by Stahl (Bot. Zeit. xxxvii. p. 129); 
but is this so? for the species described are not the same. Le this 
as it may, Hanstein, in 1872, has noticed the appearance of parti- 
tion-walls in Vaucheria; and Schaarschmidt, judging from a short 
analysis of his paper, written in Hungarian in November 1882 
(‘ Biologisches Centralblatt’), had also done the same. ‘The speci- 
mens exhibited had been observed by Dr. Wright in 1879. 
Echinobotryum atrum, Corda.—Mr. Greenwood Pim showed 
Echinobotryum atrum, Corda. This curious fungus is found parasitic 
on the stems of certain moulds, usually in this case Stysanus or 
Pachnocybe. It consists of groups of pear-shaped nearly black 
spores, resembling perithecia. It is referred to the Torulacei by 
Cooke, but its affinities with that group seem very doubtful. Some- 
thing like mycelium was noticed in one or two instances. Possibly 
culture may reveal something more of its history. The present 
example appeared in abundance on the cut surface of an elm-branch 
at Monkstown. 
Haliphysema Tumanowiezii new to Ireland.—Prof. Haddon 
showed Haliphysema Tumanowiczii from Dalkey Island, taken in 
1882, the first recorded Irish example. 
Cosmarium plicatum, Reinsch, forma majus, from damp walls 
in a warm House at Glasnevin Botanic Garden.—Prof. M‘Nab 
showed some gelatinous stuff from the walls of one of the warm 
houses at Glasnevin Botanic Garden, formed by the confluent mucous 
