MYCOLOGICAL NOTES FOR 1920 165 
3. PmLacrE Petersit B. & Br. 
This rare species was found for the first time in the writer’s 
experience on a dead snag of Acer rubrum, July 1, 1920, on Stone 
reek, Huntingdon County, Pennsylvania. Hundreds of the 
small brown stipitate fruiting heads were present on a small 
area (PLATE 9, FIG. 4), and their abundance suggested that 
this species is probably not so rare as has been supposed but, 
because of its small size and inconspicuous coloration, is usually 
@ © 
Fics. 1-4. PILAcre Perersi B. & Br. 
1. Hyphae with clamp connections. 2 and 3. Basidia with spores. 
4. Spores. 
overlooked. Cross-septate basidia characteristic of the Auricu- 
lariales are always difficult to demonstrate, but the writer has 
located them with more ease in this species than in any other, 
though not readily demonstrable at best (TEXT FIGS. 2 and 3). 
The fungus departs widely in consistency and habit from other 
members of the order. The following descriptive notes are 
appended: 
Sporophores gregarious on the daecst sae cancun Seow 
ing from a slight superficial gray mycelium, 2-5 
consisting of a slender stalk bearing a tits Siobhan or 
hemisphaeric head; head 0.5-2.5 mm. in diameter, at first gray- 
pruinose, then deep brown, covered by a thin membrane that 
disappears at maturity, filled with a ‘perl spore mass mixed 
either side of the basidium if — but on the convex surface 
if curved; hyphae re then brown, somewhat bra bey 
with cross walls and clamp connections, 2-3 yw in premix 
