410 Bay liss- Elliott and Grove. — Roesleria pallida , Sacc. 
round and compressed, circular in face view, 4 -§-6 [x broad, narrowly 
elliptical in profile, 2^-3 /m thick. Paraphyses very much longer than the 
asci, filiform when young, then branched and anastomosing, septate, whitish, 
3 ix broad, undulated, and entangled at the periphery so as to form 
a pseudo-peridium. Asci soon diffluent, and spores then forming a thick 
layer between the hymenial disc and the peridium. 
The spores are singly colourless, but yellowish or isabelline in mass. 
They are placed in the ascus with their flat sides in contact, like a pile of 
coins (Figs. 4 and 6). Each of them is lens-shaped in vertical section, the 
Fig. 4. Portion of hymenium, showing ascospores (stained), apparently in f chaplet ’-form on 
a pedicel, x 400. Fig. 5. Anastomosing paraphyses forming the peridium. x 400. Fig. 6. Asci 
containing ascospores. x 800. 
margin of the lens being slightly flattened so as to form a ridge surrounding 
it like a frame : this causes the spore when seen in face view to be bordered 
with a narrow halo (Fig. 8, a), and is the origin of the phrase ‘ crasse 
i-nucleatis’ applied to them by Saccardo. When seen in exact profile, the 
spore appears to be crossed along its greatest diameter by one or two 
narrow dark lines (according to the focusing of the objective), which are the 
places where the surface undergoes a sudden change of convexity (Fig. 8,$). 
When the spores are in the young ascus they are tightly packed so as 
to give them a squarish appearance (Fig. 7), but when the ascus begins to 
