[MATTHEW CLIMATIC ZONES IN DEVONIAN TIME 129 
Upper Devonian. 
Hamil- 
ton Port Chem- | Cats- 
age. ing. kill. 
Equisetites Wrightiana, Dn (Dawson) ......|........ x 4 
Cyclostiomayafine ADN MERE REIN INTER x x 
Lepidodendron Chemungense Hall. ........|........1........ x 
L. primævum, Rogers (or L. Veltheimianum). x X X 
RCD ER aera SS ELT) RNS os X DOI aby hays 23: 
Esilophyionpenceps MDN: 14 HAL Eu Dep Lan, te x 
es ews Dem WOW sooo as (san) wees) aie © va al SOU MCE pe OEE ee 
Haliserites Dechenianus v. lineatus Penh....}........)........ x ; 
Lomatophloios antiquus, Dn............... NT EEE oh vaca ah bea 
PCH GERIS JACKSON ON yn te cites NN LANTA NC GRR x 
A. sphenophyllifolia, Lesq................. > > IRAN ISR oer 
PATO GUSAN SI SCIE eee LEUR RE à OS APRES RIRE LE 1. X x < 
AeeLalliananGOppe econ ween clk a: NAGE ihre Out ET oe aie STE Snel 
PSP OAUDES ASIE ME oe DENN. AE NOR hk RAS DL LES nb 
ARorers in lie Sens yas DT AU arte au ln en AT PAL SU a Un x 
Asteropteris Noveboracensis Dn............1........ x x 
Dadoxelon’ Clarict Dre: NN ETAT Aes PRE CU PRET bn | EEN PE ME | 
Cladoxylon cf mirabile, Ung. Dn........... SE NE NOR eos 
Celluloxylon primævum Dn...... SCO Een op eae OA 
It will be noted that all the species reported from the Middle 
Devonian (Hamilton), except those based on stem-structure, are with 
one exception either Lepidodendra or Psilophyta and the former are 
all of the small bolstered species that prevailed in the upland floras of 
the Devonian. The Psilophyta appear to have been determined from 
stem remains alone; but while the stems are to a certain extent 
diagnostic, the determination is uncertain if no fruits are present. 
The narrow leaves of both these plants (and of the Cyclostigma) in- 
dicate a dry habitat or a dry climate, and as there are no remains 
of the fern-leaved plants (except Archeopteris sphenophyllifolia) it 
may be that the whole collection is allocthone. 
With the Upper Devonian, conditions were different, many of 
the plants preserved are those that bore broad leaves that would not 
bear the rough usage of a transporting current, and so we may suppose 
that most of them were indigenous to the place where they were 
collected. 
This Upper Devonian flora seems to have been specially marked 
by the prevalence of different species of Archæopteris, for the table 
contains six species of the genus; and although some of these may be 
varieties only, the prevalence of plants of this type is marked. Their 
intimate association with Lepidodendra would indicate that they were 
lovers of an upland country, rather than of deltaic districts, and it 
may be suggested that in these Devonian plants we have chiefly re- 
presentatives of an upland flora. These two groups of plant remains, 
Sec. IV., 1911. 9. 
