﻿of North America. 15- 



led, light green, pellucid, broadly and sometimes indistinctly 

 costate, bearing beneath very numerous small, pyriform or sub- 

 globose tubers, these .15-. 3 mm. in diameter, on slender peduncles 

 .2 5-.6 X .08-.09 mm.; major segments oblong, obcuneate, or. sub- 

 linear, 2-8 X 1-2 mm., lightly canaliculate when dry, subcrenate at 

 apex, 5-8 cells thick in middle becoming 3- or rarely 2-stratose at 

 margin ; surface-cells very distinct, protuberant, subquadrate- 

 rhombic to oblong-pentagonal, 36-75 X 30-45 /i, the inner cells, 

 especially toward the margin, very large and hyaline : dioicous:* 

 involucre large, infundibuliform, incised at the mouth; capsule, 

 spores and elaters nearly as in A. larois. 



" Banks of the Caloosahatchee River, southwest Florida, Mar., 



1878; rare" (Austin). 



Type in Herb. Pearson; duplicate in Herb. Columbia Univer- 

 sity and Herb. Underwood. Though we' have had the privilege 

 of examining all the material of this species in the three herbaria 

 mentioned, we have found no involucre, and for that can simply 

 copy the description of Austin. A portion of a single capsule 

 was found lying on the thallus, but the organic connection of the 

 two could not be determined, though there was no indication of a 

 mixture with any other species. This bore yellow, granulose- 

 papillate spores, 42-45 /j. in maximum diameter, and elaters like 

 those of A. laevis. Austin in his notes following the diagnosis 

 describes the spores as " smooth or nearly so/' but he also char- 

 acterized those of A. laevis as " nearly smooth." f 



A. Donnellii is somewhat allied to A. dichotomies and A. phyma- 

 todes, but evidently differs from both in the pellucid thallus, the 

 very distinct surface-cells, the less elongated segments, in the 

 smaller, more numerous tubers on shorter, narrower peduncles, 

 springing from the region of the costa but often in groups of 3-8 

 and somewhat laterally distributed, and is probably different also 

 from both in the form of the involucre and from A. dichotomies in 

 the thickly granulose-papillate spores. 



7. Anthoceros punctatus L. Sp. PL 2 : 1 1 39. 1753- 

 Anthoceros scanosus Aust. Proc. Acad. Nat. Sci. Philad. 230 



1869. 



* The description from this point on is from the Latin of Austin's original diag- 



nosis. 



f Bull. Torr. Bot. Club, 6: 25. 1875. 



