368 BOTANICAL GAZETTE | May 
sporophyte, and a little of its physiology. Such guidance may teach labora- 
tory methods, may collect a mass of unrelated facts without any reference to 
their importance; but it never can result in a clear conception of plants. 
A good teacher can manage to get along with a lot of poorly digested 
material, although it is an unnecessary burden, but misrepresentation is 
unpardonable. We do not have space to quote the many remarkable state- 
ments noted in a casual reading of this book, but we must justify our strictures 
by presenting a few. 
The form of the plant (thallophyte) which bears simple spores is known as the 
sporophyte (p. 9). 
e male gamete (in spermatophytes) is either the original nucleated protoplasm 
of the pollen grain, or is one of the nucleated cells formed by the division of that 
protoplasm in the formation of the Lib prothallium in a tube which grows out ae 
pollen grains (p. 11). 
Seeds, in the higher plants, result from the fertilization of ovules by pollen grains. 
Seeds grow directly into aes cies plants when the conditions are favorable. Spores 
result from cell divisio They contain no embryo and do not grow into —-. 
Plaats (p36) 
n the cells of nea modified leaves of this cluster (in en minute anther- 
= are sia (p. 
ospore is sca up above the top of the female plant by a very slender 
stalk, the pe8 and develops there into the sporophyte form of the plant (p. 38). 
The enlarged top that develops on the female plant (in mosses) is a sporan 
(p. 38). There is 
No sexual reproduction is known to occur in this class (schizophytes). ‘The 
consequently no alternation of generations from sporophyte to gnc 
plant is the sporophyte (p. 59). 
A zygospore is thus produced (in Spirogyra) tha 
the bottom of the water, where, imbedded i in the mud, it preserves the 
until the next season. On thereturnof s , the ple grows 
into a new filament... This is gonidial iso street (p. 9 : ’ 
Male gametes (in lichens), _— conjugate with eine gametes, trichogyn® 
inside the tissues of the hyphe (p. 
A spore fruit results in i and the spores develop by fission of 5 into 
small and simple growths called profoneme, from which new plants walk nil 
Mosses are reproduced asexually by different modes of budding, but no 
is known, by asexual spores (p. 176). F thet 
The capsules (in mosses) siunanati the egg cells become econ 
closely resemble the asexual spores of some other plants (p- ! 177). the 
rom this fact that their structure is pega cellular, the plants of 
subdivisions are called cellular cryptogam 83). 
When the spores germinate (in pride tes), there is ae ne 
which develops into a small thalloid leaf called prothallium \p ip 1056 ed under the 
If the under side of one of these heart-shaped prothallia be —_— 
microscope, special differentiations of the cells will be found near ps 
heart ; these are the archegonia or pistillidia; they are T ounded aggrcé® 
gium 
t becomes ency “sted and falls to 
life of the plant 
he asexual way 
so far 45 
preceding 
protonema 
