Arthur: Uredinales of Porto Rico 
247 
the form on M. pectinatmn, the teliospores measuring about the 
same length, but half as much wider. The South American 
species should be called Puccinia tucumanensis (Speg.) comb, 
nov. 
Type material of P. medellinensis agrees perfectly with the 
Stevens’ collections on M. pectinatum, and also with the collec- 
tions cited in the North American Flora on page 213 of volume 
7. Type material of Aecid. Hyptidis P. Henn. also agrees with 
this species in morphological characters, and the host appears to be 
M. pectinatum, as well as one can tell from a few leaves. 
* All collections so far seen on M. atrorubens and M. suaveolens 
show only urediniospores. The teliospores of P. Hyptidis and 
P. medellinensis, as well as P. tucumanensis are readily told 
apart, but the urediniospores of these species all have two equa- 
torial pores, and otherwise are too much alike to be distinguished 
with certainty when taken by themselves. So far as any differ- 
ences exist, and especially in the large proportion of uredinio- 
spores with the vertical axis shorter than the transverse axis, they 
indicate that the forms can best be placed here. 
63. Puccinia Hyptidis (M. A. Curt.) Tracy & Earle, Bull. 
Miss. Exp. Sta. 34:86. 1895. 
Eriosporangium Hyptidis (Curt.) Arth. N. Am. Flora 7:211. 
1912. 
On Lamiaceae (Labiatae) : 
Mesosphaerum capitatum (L.) Kuntze (Hyptis capitata 
Jacq.), Mayagiiez, Jan. 7, 57, Jan. 30, 303, Jan. 28, 374; 
Villa Alba, Jan. 3, 705, 136, 14^; Coamo Springs, Jan. 
i, 100; Vega Baja, Feb. 20, 471; Ahasco, Oct. 12, 35^6; 
Rosario, Oct. 27, 3S26, Nov. 14, 4841; Quebradillas, 
Nov. 22, 3166; Monte de Oro near Cayey, Dec. 13, 3707 i 
Lares, Nov. 22, 3932; El Gigante near Adjuntas, Dec. 
15, 6023. 
The above numbers show only uredinia, and the assignment to 
Puccinia Hyptidis is somewhat uncertain. The size of the uredi- 
niospores, thickness of wall, echinulation, pore-arrangement, and 
the rarity of flattened spores in which the vertical diameter is less 
than the transverse, are all characters that agree with those of 
