88 BOTANICAL GAZETTE [JANUARY 
Apamson” decides that they are developed “for purposes of aeration as shown 
by the great development of lacunar tissue.” Both the horizontal and the 
vertical roots possess very loose cortical tissue with large lacunae, but most 
botanists would probably hesitate to pronounce upon the purpose of its develop- 
ment. The upright roots have well developed root caps, and possess MO 
lenticels or other stem characters found in many pneumatophores.—Geo. D. 
ULLER 
Seed of Neuropteris.—In 1904 Kinston described the seed of Newropieris 
heterophylla, which was said to be “as large as a hazelnut.” Now the same 
investigator, associated with Joncmans, has described?’ the seed of N. obliqua 
Brong., the specimens being in the Rijks Herbarium at Leyden. The seeds 
have the same general structure as those of NV. heterophylla, but are about 
twice as large. This species of Neuropteris is also doubtless to be referred to 
the stem genus Medullosa.—J. M. C. 
Root parasites.— Miss Benson” has studied the structure of some haustoria 
on the roots of Exocarpus and Thesium, showing the nature of the penetration 
and connection with the roots of other plants. For a portion of the li 
elements of the haustoria the name “phloeotracheids” is suggested, and the 
investigator thinks they may act as a filter between the host and parasite, 
although the evidence that they have any such function does not seem to be at 
all convincing.—Gro. D. FuLrer. 
Calcium salts and fungi.—Wetr® concludes that soluble calcium salts are 
necessary to the complete development of higher fungi. Coprinus plicatilis, 
C. papillatus, C. nivens, and C. ephemoides showed little if any mycelial develop- 
ment, and no development of fruit heads or spores, when all the calcium present 
was in the form of the oxalate-—WILLIAM CROCKER. 
A bog in central Illinois.—Gares® has instanced the _— of northern 
and southern forms in a bog in central Illinois —-Gro. D. FULLE 
36 ApAMSON, R. <i Note on the roots of Terminalia Arjuna. New Phytol. 9: 
150-156. figs. 3-7. 19 
37 KipsTov, R.., tod ick W. J., Sur la fructification de Neuropteris obliqua 
Bgt. Archiv. Née 1. S ci. LET. B. 325, 26. pl. 1. torr. 
28 BENSON, MARGARET, Root parasitism in Exocarpus (with comparative notes 09 
the haustoria of Thesium). Ann. Botany 24:667-677. pl. 65. figs. 4- 1910. 
TR, James R., Bendtigt der Pilz Coprinus Kalksalze zu seinen physiologischen 
ec ake Flora 103:87-99. t191T. 
3 Gates, F. C., A bog in central Illinois. Torreya 11:205-2I1. I9I!. 
3, he ce 
