-71 — 
or nearly so on both sides or somewhat rough on back toward apex ; 
costa at base about 100^ wide and one-fourth width of leaf, semi- 
terete, slightly excurrent, in cross-section showing 9 or 10 guide- 
cells with stereid bands and some accessory guide-cells above and 
below and outer cells more or less differentiated ; cells of lower leaf 
mostly rectangular with somewhat thickened, brownish walls, rarely 
slightly pitted, the alar often broader, very rarely forming a rather 
distinct group ; cells of upper leaf shorter, square to rectangular, 
about 6^ wide and 1 to 3 times longer ; the narrow blade or border 
of upper leaf of a double thickness of cells ; fruit unknown. 
Type locality. Onoko Glen, Pennsylvania. E, A. Rau. 
Distribution. Only known from type locality and Tallulah Falls, 
Georgia. 
Exsiccati. Small, M. of the Southern U. S. no. 51. 
This moss has nmch the appearance of Trichostomum Hibernicum 
(Mitt.) Dixon, but this latter has a narrower leaf base, leaf point 
stouter and entire, and cells papillose and rounder above. It is at 
once distinguished from Dicranum fulvum by the broad, imbricate leaf 
base, the stems without tomentum, the costa thicker and one-half as 
wide, and the lack, mostly, of a distinct alar group of cells. 
New York Botanical Garden. 
Fig. 1. Austinella Rauei. Median leaf-cells X 270. 2 & 3. Cross- 
sections of costa X 270. 4. Upper stem leaf X 16. 
