о РСТ Айбы лал B „Аа; 
ACTINOCOCCUS 115 
From Actinococcus peltaeformis Schmitz, A. mollis differs in 
its external cushions being more gelatinous, and hemispheric or 
subglobose rather than plano-convex, in protruding 0.45-1.3 mm. 
instead of 0.3-0.5 mm. from its host, in having an attachment 
base that is $-$, instead of 16-і of its horizontal diameter, in 
its scarcely tapering cortical filaments, in the lower and median 
cells of these filaments having about one half the width of the 
corresponding cells in A. peltaeformis, etc. 
From Actinococcus aggregatus Schmitz, A. mollis differs in being 
more gelatinous and collabent, in the external cushions being 
hemispheric or subglobose rather than plano-convex and 0.45-1.3 
mm. instead of о.16-0.24 mm. high, in the much longer cortical 
filaments, in the longer and narrower cells of the cortical filaments, 
in the mostly narrower sporangia, etc. 
From Actinococcus latior Schmitz,* originally described as 
parasitic on the South African Gymnogongrus dilatatus, and from 
the Californian plantf that has sometimes{ been identified with 
A. latior, Actinococcus mollis differs so much that detailed com- 
parisons would hardly seem necessary. 
An examination of authentic material of Actinococcus exul 
Ж ACTINOCOCCUS LATIOR Schmitz, Flora 77: 387. 1893. Сивһіопв suborbicular 
to elliptic in outline, strongly convex, 1-4 mm. in diameter (0.6-1.0 mm. high), firm, 
closely sessile, affixed by а base М-14 as broad; cortical filaments 0.3-0.5 mm. long, 
usually tapering at apex, their cell protoplasts 13-194 Жб-8 и, mostly rounded at their 
ends and separated by hyaline intervals 3-74 broad; sporangia 4-parted, 28-36 u X 
13-18 и. Оп Gymnogongrus dilatatus, Cape of Good Но 
Actinococcus Chiton sp. nov. Cushions usually elliptic-oblong, less commonly 
suborbicular, 2-8 mm. long, 1—3 mm. wide, umbona m or convex along axis with a 
flat spreading border, 0.65-0.85 mm. in maximum height, firm, coriaceous or sub- 
corneous on drying, closely sessile or clasping, MI ы а Базе 14-% as broad; 
cortical filaments 0.16-0.35 mm. long, scarcely tapering at apex; their cell protoplasts 
8-134 X5—6u, with ends truncate and closely s aps, or separated by intervals 
1–3 и broad; sporangia 4-parted, 14-22и Х8-ТІ ste linearis, Cali- 
fornia (type, Collins, Holden, & Setchell, аны Boral епсапа по. 1443, 
issued аз Actinococcus latior Schmitz,—in herb. N. У. Bot. Gard. "j The cushions by 
their elliptic-oblong outline, elevated axial parts, flat ierit and closely appressed 
habit, often suggest in minature certain species of molluscs of the genus Chiton, 
whence the specific name. It would appear that Gomont (Jour. de Bot. 8: 135. 134. 
1894), working with sterile petat was inclined to consider the parasite of Gym- 
nogongrus linearis a new species of Actinococcus, and that Schmitz, to whom Gomont 
submitted his preparations, was even of the opinion that it might constitute the type 
of a new genus 
t Setchell, W. A. LaNuova Notarisia 16: 59. 1905. 
