BARTRAM: TORTULA IN SOUTHERN ARIZONA 337 
Exsicc:—Holz. Musc. Ac. Bor. Am. No. 500 as Torzula 
pagorum, 
Bartr. Mosses of So. Arizona No. 15 as T. pagorum.—No. 
g1 and No. 95. 
TORTULA ALPINA (Bry. eur.) Bruch. var. PROPAGULIFERA 
Limp. in Rab. Krypt. Fl. 4: 683. (Tortula pagorum (Milde.) 
DeNot.; Barbula laevipila var. pagorum Husn.) The presence 
of characteristic propagula as figured by Limpricht, Vol. 1: 
682* is the only character by which it seems possible to separate 
this variety from the plants referred elsewhere to 7. alpina. 
In the same tuft are found plants with abundant propagula, 
others with only a few and still others devoid of them entirely. 
The dry plants with leaves folded lengthwise and tightly spirally 
incurved into a close head, the tendency of the hair point to be- 
come reduced to a short, more or less roughened arista, colored 
at the base, and the apparent preference for a rock substratum 
even where trees are available are all characters, which as far 
as the collections from this region are concerned, indicate a 
closer relationship to 7. alpina than to T. laevipila. While the 
absence of any plants typical of T. laevipila is only a negative 
factor it is not without suggestion when compared with the 
distribution of the 7. alpina composite over the same area. 
Exsicc:—Holz. Musc. Bor. Am. No. 360 as Tortula pagorum. 
Small Mosses of So. U. S. No. 39 as Tortula papillosa. 
TORTULA ALPINA (Bry. eur.) Bruch. var. INERMIS (Milde.) 
DeNot. One of the very characteristic mosses of dry shaded, 
vertical rock faces in canyons of the Santa Rita Mts. and the 
Patagonia Mts. The plants grow in loose mats so lightly at- 
tached to the substrata that when sections are removed for 
specimens they seem to hang from the rock face like a curtain. 
The lamina structure is rather tender and fragile, much as in 
T. fragilifolia but not nearly so pronounced, the leaves are wide 
in the upper half with a broadly rounded apex, shortly mucronate 
by the excurrent red-brown costa, very similar to the outline of 
T. latifolia but always distinctly mucronate or even cuspidate. 
A fine moss agreeing in every essential particular with E. Bauer 
Musc. eur. Exsicc. No. 1595a, b from Italy also with a collection 
* Limpricht’s figure more closely reproduces the shape and appearance of 
these “brood leaves” than either figure 52, p. 86, or figure 53, p. 87, in Correns 
Vermehrung der Laubmoose. 
