1918] STEVENS—MELIOLA PARASITES 235 
mous or verticillate branching. Conidia terminal and solitary or 
more rarely in clusters, pear-shaped, rounded or obtuse at base, 
acute at apex, 15-20X5-7 u. Spores, mycelium, and conidio- 
phores encrusted with minute granules. 
On Meliola paulliniae Stev. on Paullinia pinnata, 376, Vega Baja. 
This is clearly differentiated from the other species by the shape of the 
spores. : 
Arthrobotryum Ces. 
The forms here under discussion are characterized by fuscous 
to dark mycelium, conidiophores, and spores; conidiophores long, 
straight, and fascicled in typical coremia. The coremia are in the 
main straight and rigid, the component fibers running approxi- 
mately parallel and are firmly agglutinated. They are not sporifer- 
ous upon the lower parts, but possess a well marked, long, non- 
sporing stipe. The extreme distal parts of the coremia are usually 
swollen to more or less cylindrical or conical heads, although in 
some species the head is but poorly developed. The spores are 
elliptical or falcate, 2 or 3-septate, fuscous. Such structure clearly 
places these forms in the Stilbaceae-Phaeostilbeae-Phragmosporae. 
They are usually regarded as belonging to the genus Podosporium, 
and 3 species growing on Meliola have been described: P. penicil- 
lium Speg. (Fung. Arg. Pug. IV. n. 117), P. penicilliotdes Karsten 
and Roum. (Rev. Myc. 12:77. 1890), P. densum Pat. (Jour. de 
Botanique 11:373. 1897). Examinations of original figures of the 
type species of this genus (P. rigidum Schw. Syn. Amer. Bor, n. 2608, 
Trans. Am. Phil. Soc. n.s. 4) and of a specimen of Exuis (N.A.F. 
no. 416), which agrees with description and type figure fully, shows 
the Podosporium coremium to be pleurogenous and without heads, 
and therefore to be clearly distinct generically from the forms under 
discussion. 
Comparison with figures of the type species of Arthrobotryum 
Ces., A. stilboideum (Engler and Prantl, Die Nat. Pflanzenfam. 1: 
pt. 1. fig. 257D), and with figures of later species placed in this genus 
(Jour. Linn. Soc. 35:13. pl. r. figs. 13-15. 1901) show complete 
generic agreement. 
While these structures have been regarded by some as independ- 
ent species of fungi growing as parasites upon Meliola, GAILLARD 
