﻿12 Howe: The Anthocerotaceae 



Nostoc 



diameter 



thallus of the species. 



belonging to a parasitic fungus, occur somewhat sparingly in the 



thallus and may be what Austin referred to as " black, tuber-like 

 gemmae/' The fungus is described in more detail in our remarks 

 upon Anthoceros Ravenelii. 



5. Anthoceros ph^matodes sp. nov. 



Thallus dark green, blackening on drying, dissected ; the seg- 

 ments dichotomous, oblong or linear in sterile plants, broader in 



the fertile, 4-10X.5-2.5 



htly ascending 



at the apices, at first radiate, becoming later intricately entangled, 

 narrowly canaliculate dorsally, with ascending sinuate or repand 

 margins, obtuse, carinate with a broad thick, very distinct or some- 

 times obsolescent, naked or sparingly radiculose costa, this occu- 

 pying nearly the whole of the narrower segments and sending 

 down here and there a fleshy or elongated and slender process 

 .4 mm. in thickness), terminated by a globose or ellipsoidal 

 tuber, the latter .25-1 mm. in diameter, pale when living, yellow- 

 ish-brown on drying, becoming finally closely covered with root- 

 hairs; thallus 10-16 cells thick in region of costa, passing gradu- 

 ally or rather abruptly into the more or less extended 5-3-stratose 

 marginal lamina; surface-cells rhombic to rhombic-oblong, 33-66 

 X 20-33 /i, indistinct after drying : involucres separate, cylindrical, 

 I.7-2 X -5 mm., smooth, truncate, entire or slightly repand at the 

 mouth. (Plates 324 and 325.) 



On compact soil in a nearly level open plot about fifty feet 

 north of -The Old Mill," Mill Valley, Marin Co., California 

 (Howe: Mar. 19, 1892,. and Feb. 22, 1896; the latter, which 

 bears the involucres, we consider the type). Also collected by 

 Dr. Bolander at u Oakland, on slides near the bay." The few 

 capsules that have been seen are very immature, projecting only 

 about I mm. beyond the mouth of the involucre, and it is quite 

 possible that the description of the involucre given above will need 

 some modification on the discovery of fully ripened sporogonia. 



It is practically certain that this species is, in part, at least, 

 what Austin referred provisionally to Anthoceros caespiticuts De Not. 

 (Bull. Torr. Bot. Club, 6: 26 1875), drawing his description, how- 

 ever, " from a specimen in Herb. Torrey under the name A. laevis 

 Linn., from the Island of C >r*ica." We had thought to take up for 

 A.phymjitoJes the specific name Torreyi Aust. MS., which appears in 



