108 Rhodora [APRIL 
EXPLANATION OF PLATE 46. 
Choanephora cucurbitarum (Berk). 
Fig. 1. Mature fertile hypha bearing about twelve secondary sporiferous 
heads, X 100, 
Fig. 2. Terminal portion of a similar hypha; the spores just beginning to bud 
from the surface of the head, X 100. 
Fig. 3. Primary head from which the fertile ramuli are developing, one at the 
. right furcate, X 390. 
Fig. 4. Primary head from which the ramuli have fallen leaving it clathrate 
X 390. 
Fig. s. Sporiferous secondary head, X 175. 
Fig. 6. Spores, 860. 
Monoblepharis polymorpha Cornu. 
Fig. 7. Three oogonia the two upper with mature exogynous oospores, X 390. 
Fig. 8. A zoosporangium and oogonium, 390. 
Monoblepharis sp. 
Fig. 9. Zoosporangium, X 500. 
Monoblepharis brachyandra Lagerh. 
Fig. ro. Two mature oogonia above an intercalary antheridium, X 390. 
Fig. 11. Zoosporangium with abnormally developed antheridium at right, X 930. 
Fig. 12. Biciliate zoospore, X 930. 
The figures are drawn with camera lucida and slightly reduced from the approxi- 
mate magnifications indicated. 
RECENTLY RECOGNIZED SPECIES OF CRATAEGUS IN 
EASTERN CANADA AND NEW ENGLAND, — II. 
M C. S. SARGENT. 
§ MOLLEs. 
Crataegus exclusa, n. sp. Crataegus Pringlei, Sargent, RHO- 
DORA, iii. 21 in part (1901). — 
Leaves ovate, acute or acuminate, rounded, truncate or broadly 
cuneate at the glandular entire base, coarsely doubly serrate above, 
with straight gland-tipped teeth, and divided into three or four pairs 
of short acute lateral lobes ; when they unfold coated above and on the 
midribs and veins below with long pale hairs, more than half grown, 
membranaceous and still slightly villose or nearly glabrous on the 
upper surface when the flowers open; at maturity thick and firm in 
